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/worker/tsconfig.json

@@ -3,6 +3,7 @@
   "compilerOptions": {
     "outDir": "./dist",
     "rootDir": "./src",
+    "skipLibCheck": true,
     "paths": {
       "@sdi/database": ["../../packages/database/src"],
       "@sdi/shared-types": ["../../packages/shared-types/src"]