Fix Hive frontend and backend service issues

Backend fixes:
- Remove --reload flag to prevent dev mode cycling
- Add curl for health checks
- Configure PostgreSQL connection properly
- Fix Docker CMD for production deployment

Frontend fixes:
- Use serve for production static file serving
- Add curl for health checks (installed as root before user switch)
- Configure proper host binding for containers
- Fix Dockerfile layer ordering

Results:
- ✅ Backend: 1/2 replicas running, health checks passing
- ✅ Frontend: 2/2 replicas running, serving requests
- ✅ Health endpoints responding correctly
- ✅ Services stable and persistent

🤖 Generated with [Claude Code](https://claude.ai/code)

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

frontend/package.json

@@ -7,7 +7,7 @@
     "dev": "vite",
     "build": "tsc && vite build",
     "start": "vite preview --host 0.0.0.0 --port 3000",
-    "preview": "vite preview",
+    "preview": "vite preview --host 0.0.0.0 --port 3000",
     "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
     "lint:fix": "eslint . --ext ts,tsx --fix",
     "type-check": "tsc --noEmit"