Fix TypeScript compilation errors

- Remove unused imports (IsString, Queue)
- Remove unused variables in services.service.ts
- Add skipLibCheck to worker tsconfig
- Set declaration: false in API tsconfig to avoid type portability errors

apps/api/tsconfig.json

@@ -2,7 +2,7 @@
   "extends": "../../tsconfig.json",
   "compilerOptions": {
     "module": "commonjs",
-    "declaration": true,
+    "declaration": false,
     "removeComments": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,