feat(api): improve Swagger/OpenAPI documentation

- Fix Uuid and DateTime schema references (convert to String types)
- Add Bearer authentication scheme with global authorize button
- Add detailed descriptions to all API routes
- Reorganize tags into logical categories (books, libraries, indexing, tokens)
- Add security requirements and response documentation
- Fix dead_code warning

apps/api/src/books.rs

@@ -13,6 +13,7 @@ pub struct ListBooksQuery {
     pub library_id: Option<Uuid>,
     #[schema(value_type = Option<String>)]
     pub kind: Option<String>,
+    #[schema(value_type = Option<String>)]
     pub cursor: Option<Uuid>,
     #[schema(value_type = Option<i64>, example = 50)]
     pub limit: Option<i64>,
@@ -20,7 +21,9 @@ pub struct ListBooksQuery {
 
 #[derive(Serialize, ToSchema)]
 pub struct BookItem {
+    #[schema(value_type = String)]
     pub id: Uuid,
+    #[schema(value_type = String)]
     pub library_id: Uuid,
     pub kind: String,
     pub title: String,
@@ -29,18 +32,22 @@ pub struct BookItem {
     pub volume: Option<String>,
     pub language: Option<String>,
     pub page_count: Option<i32>,
+    #[schema(value_type = String)]
     pub updated_at: DateTime<Utc>,
 }
 
 #[derive(Serialize, ToSchema)]
 pub struct BooksPage {
     pub items: Vec<BookItem>,
+    #[schema(value_type = Option<String>)]
     pub next_cursor: Option<Uuid>,
 }
 
 #[derive(Serialize, ToSchema)]
 pub struct BookDetails {
+    #[schema(value_type = String)]
     pub id: Uuid,
+    #[schema(value_type = String)]
     pub library_id: Uuid,
     pub kind: String,
     pub title: String,
@@ -54,19 +61,22 @@ pub struct BookDetails {
     pub file_parse_status: Option<String>,
 }
 
+/// List books with optional filtering and pagination
 #[utoipa::path(
     get,
     path = "/books",
     tag = "books",
     params(
-        ("library_id" = Option<Uuid>, Query, description = "Filter by library ID"),
+        ("library_id" = Option<String>, Query, description = "Filter by library ID"),
         ("kind" = Option<String>, Query, description = "Filter by book kind (cbz, cbr, pdf)"),
-        ("cursor" = Option<Uuid>, Query, description = "Cursor for pagination"),
+        ("cursor" = Option<String>, Query, description = "Cursor for pagination"),
         ("limit" = Option<i64>, Query, description = "Max items to return (max 200)"),
     ),
     responses(
         (status = 200, body = BooksPage),
-    )
+        (status = 401, description = "Unauthorized"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn list_books(
     State(state): State<AppState>,
@@ -120,14 +130,20 @@ pub async fn list_books(
     }))
 }
 
+/// Get detailed information about a specific book
 #[utoipa::path(
     get,
     path = "/books/{id}",
     tag = "books",
+    params(
+        ("id" = String, Path, description = "Book UUID"),
+    ),
     responses(
         (status = 200, body = BookDetails),
         (status = 404, description = "Book not found"),
-    )
+        (status = 401, description = "Unauthorized"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn get_book(
     State(state): State<AppState>,

apps/api/src/index_jobs.rs

@@ -15,6 +15,7 @@ pub struct RebuildRequest {
 
 #[derive(Serialize, ToSchema)]
 pub struct IndexJobResponse {
+    #[schema(value_type = String)]
     pub id: Uuid,
     #[schema(value_type = Option<String>)]
     pub library_id: Option<Uuid>,
@@ -26,6 +27,7 @@ pub struct IndexJobResponse {
     pub finished_at: Option<DateTime<Utc>>,
     pub stats_json: Option<serde_json::Value>,
     pub error_opt: Option<String>,
+    #[schema(value_type = String)]
     pub created_at: DateTime<Utc>,
 }
 
@@ -35,14 +37,18 @@ pub struct FolderItem {
     pub path: String,
 }
 
+/// Enqueue a job to rebuild the search index for a library (or all libraries if no library_id specified)
 #[utoipa::path(
     post,
     path = "/index/rebuild",
-    tag = "admin",
+    tag = "indexing",
     request_body = Option<RebuildRequest>,
     responses(
         (status = 200, body = IndexJobResponse),
-    )
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin scope required"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn enqueue_rebuild(
     State(state): State<AppState>,
@@ -69,13 +75,17 @@ pub async fn enqueue_rebuild(
     Ok(Json(map_row(row)))
 }
 
+/// List recent indexing jobs with their status
 #[utoipa::path(
     get,
     path = "/index/status",
-    tag = "admin",
+    tag = "indexing",
     responses(
         (status = 200, body = Vec<IndexJobResponse>),
-    )
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin scope required"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn list_index_jobs(State(state): State<AppState>) -> Result<Json<Vec<IndexJobResponse>>, ApiError> {
     let rows = sqlx::query(
@@ -87,14 +97,21 @@ pub async fn list_index_jobs(State(state): State<AppState>) -> Result<Json<Vec<I
     Ok(Json(rows.into_iter().map(map_row).collect()))
 }
 
+/// Cancel a pending or running indexing job
 #[utoipa::path(
     post,
     path = "/index/cancel/{id}",
-    tag = "admin",
+    tag = "indexing",
+    params(
+        ("id" = String, Path, description = "Job UUID"),
+    ),
     responses(
         (status = 200, body = IndexJobResponse),
         (status = 404, description = "Job not found or already finished"),
-    )
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin scope required"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn cancel_job(
     State(state): State<AppState>,
@@ -121,13 +138,17 @@ pub async fn cancel_job(
     Ok(Json(map_row(row)))
 }
 
+/// List available folders in /libraries for library creation
 #[utoipa::path(
     get,
     path = "/folders",
-    tag = "admin",
+    tag = "indexing",
     responses(
         (status = 200, body = Vec<FolderItem>),
-    )
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin scope required"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn list_folders(State(_state): State<AppState>) -> Result<Json<Vec<FolderItem>>, ApiError> {
     let libraries_path = std::path::Path::new("/libraries");

apps/api/src/libraries.rs

@@ -10,6 +10,7 @@ use crate::{error::ApiError, AppState};
 
 #[derive(Serialize, ToSchema)]
 pub struct LibraryResponse {
+    #[schema(value_type = String)]
     pub id: Uuid,
     pub name: String,
     pub root_path: String,
@@ -25,13 +26,17 @@ pub struct CreateLibraryRequest {
     pub root_path: String,
 }
 
+/// List all libraries with their book counts
 #[utoipa::path(
     get,
     path = "/libraries",
-    tag = "admin",
+    tag = "libraries",
     responses(
         (status = 200, body = Vec<LibraryResponse>),
-    )
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin scope required"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn list_libraries(State(state): State<AppState>) -> Result<Json<Vec<LibraryResponse>>, ApiError> {
     let rows = sqlx::query(
@@ -56,15 +61,19 @@ pub async fn list_libraries(State(state): State<AppState>) -> Result<Json<Vec<Li
     Ok(Json(items))
 }
 
+/// Create a new library from an absolute path
 #[utoipa::path(
     post,
     path = "/libraries",
-    tag = "admin",
+    tag = "libraries",
     request_body = CreateLibraryRequest,
     responses(
         (status = 200, body = LibraryResponse),
         (status = 400, description = "Invalid input"),
-    )
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin scope required"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn create_library(
     State(state): State<AppState>,
@@ -96,14 +105,21 @@ pub async fn create_library(
     }))
 }
 
+/// Delete a library by ID
 #[utoipa::path(
     delete,
     path = "/libraries/{id}",
-    tag = "admin",
+    tag = "libraries",
+    params(
+        ("id" = String, Path, description = "Library UUID"),
+    ),
     responses(
         (status = 200, description = "Library deleted"),
         (status = 404, description = "Library not found"),
-    )
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin scope required"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn delete_library(
     State(state): State<AppState>,

apps/api/src/openapi.rs

@@ -1,3 +1,4 @@
+use utoipa::openapi::security::{HttpAuthScheme, HttpBuilder, SecurityScheme};
 use utoipa::OpenApi;
 
 #[derive(OpenApi)]
@@ -35,11 +36,73 @@ use utoipa::OpenApi;
             crate::tokens::CreateTokenRequest,
             crate::tokens::TokenResponse,
             crate::tokens::CreatedTokenResponse,
+            ErrorResponse,
         )
     ),
+    security(
+        ("Bearer" = [])
+    ),
     tags(
-        (name = "books", description = "Books management endpoints"),
-        (name = "admin", description = "Admin management endpoints"),
-    )
+        (name = "books", description = "Read-only endpoints for browsing and searching books"),
+        (name = "libraries", description = "Library management endpoints (Admin only)"),
+        (name = "indexing", description = "Search index management and job control (Admin only)"),
+        (name = "tokens", description = "API token management (Admin only)"),
+    ),
+    modifiers(&SecurityAddon)
 )]
 pub struct ApiDoc;
+
+pub struct SecurityAddon;
+
+impl utoipa::Modify for SecurityAddon {
+    fn modify(&self, openapi: &mut utoipa::openapi::OpenApi) {
+        if let Some(components) = openapi.components.as_mut() {
+            components.add_security_scheme(
+                "Bearer",
+                SecurityScheme::Http(
+                    HttpBuilder::new()
+                        .scheme(HttpAuthScheme::Bearer)
+                        .bearer_format("JWT")
+                        .description(Some(
+                            "Enter your API Bearer token (format: stl_<prefix>_<secret>)",
+                        ))
+                        .build(),
+                ),
+            );
+        }
+    }
+}
+
+#[derive(utoipa::ToSchema)]
+pub struct ErrorResponse {
+    #[allow(dead_code)]
+    pub error: String,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use utoipa::OpenApi;
+
+    #[test]
+    fn test_openapi_generation() {
+        let api_doc = ApiDoc::openapi();
+        let json = api_doc
+            .to_pretty_json()
+            .expect("Failed to serialize OpenAPI");
+
+        // Check that there are no references to non-existent schemas
+        assert!(
+            !json.contains("\"/components/schemas/Uuid\""),
+            "Uuid schema should not be referenced"
+        );
+        assert!(
+            !json.contains("\"/components/schemas/DateTime\""),
+            "DateTime schema should not be referenced"
+        );
+
+        // Save to file for inspection
+        std::fs::write("/tmp/openapi.json", &json).expect("Failed to write file");
+        println!("OpenAPI JSON saved to /tmp/openapi.json");
+    }
+}

apps/api/src/pages.rs

@@ -64,13 +64,14 @@ impl OutputFormat {
     }
 }
 
+/// Get a specific page image from a book with optional format conversion
 #[utoipa::path(
     get,
     path = "/books/{book_id}/pages/{n}",
     tag = "books",
     params(
-        ("book_id" = Uuid, description = "Book UUID"),
-        ("n" = u32, description = "Page number (starts at 1)"),
+        ("book_id" = String, Path, description = "Book UUID"),
+        ("n" = u32, Path, description = "Page number (starts at 1)"),
         ("format" = Option<String>, Query, description = "Output format: webp, jpeg, png"),
         ("quality" = Option<u8>, Query, description = "JPEG quality 1-100"),
         ("width" = Option<u32>, Query, description = "Max width (max 2160)"),
@@ -79,7 +80,9 @@ impl OutputFormat {
         (status = 200, description = "Page image", content_type = "image/webp"),
         (status = 400, description = "Invalid parameters"),
         (status = 404, description = "Book or page not found"),
-    )
+        (status = 401, description = "Unauthorized"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn get_page(
     State(state): State<AppState>,

apps/api/src/search.rs

@@ -25,12 +25,13 @@ pub struct SearchResponse {
     pub processing_time_ms: Option<u64>,
 }
 
+/// Search books across all libraries using Meilisearch
 #[utoipa::path(
     get,
     path = "/search",
     tag = "books",
     params(
-        ("q" = String, description = "Search query"),
+        ("q" = String, Query, description = "Search query"),
         ("library_id" = Option<String>, Query, description = "Filter by library ID"),
         ("type" = Option<String>, Query, description = "Filter by type (cbz, cbr, pdf)"),
         ("kind" = Option<String>, Query, description = "Filter by kind (alias for type)"),
@@ -38,7 +39,9 @@ pub struct SearchResponse {
     ),
     responses(
         (status = 200, body = SearchResponse),
-    )
+        (status = 401, description = "Unauthorized"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn search_books(
     State(state): State<AppState>,

apps/api/src/tokens.rs

@@ -20,6 +20,7 @@ pub struct CreateTokenRequest {
 
 #[derive(Serialize, ToSchema)]
 pub struct TokenResponse {
+    #[schema(value_type = String)]
     pub id: Uuid,
     pub name: String,
     pub scope: String,
@@ -28,11 +29,13 @@ pub struct TokenResponse {
     pub last_used_at: Option<DateTime<Utc>>,
     #[schema(value_type = Option<String>)]
     pub revoked_at: Option<DateTime<Utc>>,
+    #[schema(value_type = String)]
     pub created_at: DateTime<Utc>,
 }
 
 #[derive(Serialize, ToSchema)]
 pub struct CreatedTokenResponse {
+    #[schema(value_type = String)]
     pub id: Uuid,
     pub name: String,
     pub scope: String,
@@ -40,15 +43,19 @@ pub struct CreatedTokenResponse {
     pub prefix: String,
 }
 
+/// Create a new API token with read or admin scope. The token is only shown once.
 #[utoipa::path(
     post,
     path = "/admin/tokens",
-    tag = "admin",
+    tag = "tokens",
     request_body = CreateTokenRequest,
     responses(
         (status = 200, body = CreatedTokenResponse, description = "Token created - token is only shown once"),
         (status = 400, description = "Invalid input"),
-    )
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin scope required"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn create_token(
     State(state): State<AppState>,
@@ -97,13 +104,17 @@ pub async fn create_token(
     }))
 }
 
+/// List all API tokens
 #[utoipa::path(
     get,
     path = "/admin/tokens",
-    tag = "admin",
+    tag = "tokens",
     responses(
         (status = 200, body = Vec<TokenResponse>),
-    )
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin scope required"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn list_tokens(State(state): State<AppState>) -> Result<Json<Vec<TokenResponse>>, ApiError> {
     let rows = sqlx::query(
@@ -128,14 +139,21 @@ pub async fn list_tokens(State(state): State<AppState>) -> Result<Json<Vec<Token
     Ok(Json(items))
 }
 
+/// Revoke an API token by ID
 #[utoipa::path(
     delete,
     path = "/admin/tokens/{id}",
-    tag = "admin",
+    tag = "tokens",
+    params(
+        ("id" = String, Path, description = "Token UUID"),
+    ),
     responses(
         (status = 200, description = "Token revoked"),
         (status = 404, description = "Token not found"),
-    )
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin scope required"),
+    ),
+    security(("Bearer" = []))
 )]
 pub async fn revoke_token(
     State(state): State<AppState>,