fix: resolve TypeScript compilation errors in API

- Add explicit IRouter type to all route files
- Add explicit Express type to app.ts
- Fix env.ts by moving getCorsOrigins after parsing
- Fix token.ts SignOptions type for expiresIn
- Cast req.params.id to String() in controllers

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/routes/tenants.routes.ts

@@ -1,8 +1,8 @@
-import { Router } from 'express';
+import { Router, type IRouter } from 'express';
 import { authenticate } from '../middlewares/auth.middleware.js';
 import * as tenantsController from '../controllers/tenants.controller.js';
 
-const router = Router();
+const router: IRouter = Router();
 
 router.use(authenticate);