docs: add AGENTS.md per module and unify ports to 70XX

- Add CLAUDE.md at root and AGENTS.md in apps/api, apps/indexer,
  apps/backoffice, crates/parsers with module-specific guidelines
- Unify all service ports to 70XX (no more internal/external split):
  API 7080, Indexer 7081, Backoffice 7082
- Update docker-compose.yml, Dockerfiles, config.rs defaults,
  .env.example, backoffice routes, bench.sh, smoke.sh

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

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

@@ -13,7 +13,7 @@ export async function GET(
   const quality = searchParams.get("quality") || "";
   
   // Construire l'URL vers l'API backend
-  const apiBaseUrl = process.env.API_BASE_URL || "http://api:8080";
+  const apiBaseUrl = process.env.API_BASE_URL || "http://api:7080";
   const apiUrl = new URL(`${apiBaseUrl}/books/${bookId}/pages/${pageNum}`);
   apiUrl.searchParams.set("format", format);
   if (width) apiUrl.searchParams.set("width", width);

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

@@ -6,7 +6,7 @@ export async function GET(
 ) {
   const { bookId } = await params;
   
-  const apiBaseUrl = process.env.API_BASE_URL || "http://api:8080";
+  const apiBaseUrl = process.env.API_BASE_URL || "http://api:7080";
   const apiUrl = `${apiBaseUrl}/books/${bookId}/thumbnail`;
   
   const token = process.env.API_BOOTSTRAP_TOKEN;