feat: add /api/health endpoint for uptime monitoring

server/api/health.get.js

@@ -0,0 +1,19 @@
+import mongoose from 'mongoose'
+import { connectDB } from '../utils/mongoose.js'
+
+export default defineEventHandler(async () => {
+  try {
+    await connectDB()
+    const dbState = mongoose.connection.readyState
+    // readyState: 0 = disconnected, 1 = connected, 2 = connecting, 3 = disconnecting
+    if (dbState !== 1) {
+      throw new Error('Database not connected')
+    }
+    return { status: 'ok', db: 'connected' }
+  } catch {
+    throw createError({
+      statusCode: 503,
+      data: { status: 'error', db: 'disconnected' },
+    })
+  }
+})