refactor: streamline API calls and enhance configuration management

- Refactor multiple API routes to utilize a centralized configuration function for base URL and token management, improving code consistency and maintainability.
- Replace direct environment variable access with a unified config function in the `lib/api.ts` file.
- Remove redundant error handling and streamline response handling in various API endpoints.
- Delete unused job-related API routes and settings, simplifying the overall API structure.

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

@@ -1,35 +1,25 @@
 import { NextRequest, NextResponse } from "next/server";
+import { config } from "@/lib/api";
 
 export async function GET(
   request: NextRequest,
   { params }: { params: Promise<{ bookId: string; pageNum: string }> }
 ) {
   const { bookId, pageNum } = await params;
-  
-  // Récupérer les query params (format, width, quality)
-  const { searchParams } = new URL(request.url);
-  const format = searchParams.get("format") || "webp";
-  const width = searchParams.get("width") || "";
-  const quality = searchParams.get("quality") || "";
-  
-  // Construire l'URL vers l'API backend
-  const apiBaseUrl = process.env.API_BASE_URL || "http://api:7080";
-  const apiUrl = new URL(`${apiBaseUrl}/books/${bookId}/pages/${pageNum}`);
-  apiUrl.searchParams.set("format", format);
-  if (width) apiUrl.searchParams.set("width", width);
-  if (quality) apiUrl.searchParams.set("quality", quality);
-  
-  // Faire la requête à l'API
-  const token = process.env.API_BOOTSTRAP_TOKEN;
-  if (!token) {
-    return new NextResponse("API token not configured", { status: 500 });
-  }
-  
   try {
+    const { baseUrl, token } = config();
+    const { searchParams } = new URL(request.url);
+    const format = searchParams.get("format") || "webp";
+    const width = searchParams.get("width") || "";
+    const quality = searchParams.get("quality") || "";
+
+    const apiUrl = new URL(`${baseUrl}/books/${bookId}/pages/${pageNum}`);
+    apiUrl.searchParams.set("format", format);
+    if (width) apiUrl.searchParams.set("width", width);
+    if (quality) apiUrl.searchParams.set("quality", quality);
+
     const response = await fetch(apiUrl.toString(), {
-      headers: {
-        Authorization: `Bearer ${token}`,
-      },
+      headers: { Authorization: `Bearer ${token}` },
     });
     
     if (!response.ok) {