fix(#17): Implementiere /metrics Endpoint für Monitoring

backend/src/server.js

@@ -16,6 +16,23 @@ app.use(express.json());
 
 app.get('/health', (_req, res) => res.json({ status: 'ok' }));
 
+// Metrics endpoint
+app.get('/metrics', (_req, res) => {
+  const uptime = process.uptime();
+  const memoryUsage = process.memoryUsage();
+  
+  res.json({
+    uptime: uptime,
+    memory: {
+      rss: memoryUsage.rss,
+      heapTotal: memoryUsage.heapTotal,
+      heapUsed: memoryUsage.heapUsed,
+      external: memoryUsage.external
+    },
+    timestamp: new Date().toISOString()
+  });
+});
+
 app.use('/auth', authRoutes);
 app.use('/requests', helpRequestRoutes);
 app.use('/offers', offerRoutes);