Add global API prefix and route remapping for health checks in main.ts

server/src/main.ts

@@ -1,5 +1,6 @@
-import { ValidationPipe } from '@nestjs/common';
+import { RequestMethod, ValidationPipe } from '@nestjs/common';
 import { NestFactory } from '@nestjs/core';
+import type { NextFunction, Request, Response } from 'express';
 import { AppModule } from './app.module';
 
 async function bootstrap() {
@@ -21,6 +22,25 @@ async function bootstrap() {
     }),
   );
 
+  // Prefer a stable `/api/*` surface in all environments.
+  // Some deployments/proxies may strip `/api` (e.g. nginx rewrite), so we also
+  // accept legacy non-prefixed routes by internally re-mapping them.
+  app.setGlobalPrefix('api', {
+    exclude: [{ path: 'health', method: RequestMethod.ALL }],
+  });
+  app.use((req: Request, _res: Response, next: NextFunction) => {
+    if (req.url === '/health' || req.url.startsWith('/health?') || req.url.startsWith('/api/')) {
+      return next();
+    }
+    if (req.url === '/api' || req.url.startsWith('/api?')) {
+      req.url = req.url.replace(/^\/api/, '/api/');
+      return next();
+    }
+
+    req.url = `/api${req.url.startsWith('/') ? '' : '/'}${req.url}`;
+    return next();
+  });
+
   await app.listen(process.env.PORT ?? 3000);
 }