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/jobs/active/route.ts

@@ -0,0 +1,11 @@
+import { NextResponse } from "next/server";
+import { apiFetch, IndexJobDto } from "@/lib/api";
+
+export async function GET() {
+  try {
+    const data = await apiFetch<IndexJobDto[]>("/index/jobs/active");
+    return NextResponse.json(data);
+  } catch (error) {
+    return NextResponse.json({ error: "Failed to fetch active jobs" }, { status: 500 });
+  }
+}