feat: enhance health check endpoint with database status check

app.js

@@ -5,6 +5,7 @@ const express = require('express');
 const cors = require('cors');
 const helmet = require('helmet');
 const rateLimit = require('express-rate-limit');
+const mongoose = require('mongoose');
 
 const config = require('./config/config');
 const connectDB = require('./config/db');
@@ -53,10 +54,25 @@ app.use('/api', limiter);
 
 // ── Routes ────────────────────────────────────────────────────────────────────
 app.get('/api/health', (req, res) => {
-  res.json({
-    status: 'ok',
-    message: 'Gameno API is running',
+  const dbStates = {
+    0: 'disconnected',
+    1: 'connected',
+    2: 'connecting',
+    3: 'disconnecting',
+    99: 'uninitialized'
+  };
+
+  const dbStateCode = mongoose.connection.readyState;
+  const dbStatus = dbStates[dbStateCode] || 'unknown';
+  const isHealthy = dbStateCode === 1;
+
+  res.status(isHealthy ? 200 : 503).json({
+    status: isHealthy ? 'healthy' : 'unhealthy',
     timestamp: new Date().toISOString(),
+    uptime: process.uptime(),
+    services: {
+      database: dbStatus
+    },
     environment: config.NODE_ENV
   });
 });