feat(books): édition des métadonnées livres et séries + champ authors multi-valeurs

- Nouveaux endpoints PATCH /books/:id et PATCH /libraries/:id/series/:name pour éditer les métadonnées
- GET /libraries/:id/series/:name/metadata pour récupérer les métadonnées de série
- Ajout du champ `authors` (Vec<String>) sur les structs Book/BookDetails
- 3 migrations : table series_metadata, colonne authors sur series_metadata et books
- Composants EditBookForm et EditSeriesForm dans le backoffice
- Routes API Next.js correspondantes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/backoffice/app/api/books/[bookId]/route.ts

@@ -0,0 +1,17 @@
+import { NextRequest, NextResponse } from "next/server";
+import { updateBook } from "@/lib/api";
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ bookId: string }> }
+) {
+  const { bookId } = await params;
+  try {
+    const body = await request.json();
+    const data = await updateBook(bookId, body);
+    return NextResponse.json(data);
+  } catch (error) {
+    const message = error instanceof Error ? error.message : "Failed to update book";
+    return NextResponse.json({ error: message }, { status: 500 });
+  }
+}

apps/backoffice/app/api/libraries/[id]/series/[name]/metadata/route.ts

@@ -0,0 +1,16 @@
+import { NextRequest, NextResponse } from "next/server";
+import { fetchSeriesMetadata } from "@/lib/api";
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ id: string; name: string }> }
+) {
+  const { id, name } = await params;
+  try {
+    const data = await fetchSeriesMetadata(id, name);
+    return NextResponse.json(data);
+  } catch (error) {
+    const message = error instanceof Error ? error.message : "Failed to fetch series metadata";
+    return NextResponse.json({ error: message }, { status: 500 });
+  }
+}

apps/backoffice/app/api/libraries/[id]/series/[name]/route.ts

@@ -0,0 +1,17 @@
+import { NextRequest, NextResponse } from "next/server";
+import { updateSeries } from "@/lib/api";
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string; name: string }> }
+) {
+  const { id, name } = await params;
+  try {
+    const body = await request.json();
+    const data = await updateSeries(id, name, body);
+    return NextResponse.json(data);
+  } catch (error) {
+    const message = error instanceof Error ? error.message : "Failed to update series";
+    return NextResponse.json({ error: message }, { status: 500 });
+  }
+}