Implement Bodenfeuchte app: MQTT listener, SQLite storage, chart UI, Docker

- Custom Next.js server starts MQTT listener on boot
- Subscribes to zigbee2mqtt/Bodenfeuchte_1, stores soil_moisture in SQLite
- API route /api/data returns last 6 hours of measurements
- Frontend shows current value + Recharts line chart, auto-refresh every 60s
- Dockerfile + docker-compose with persistent volume for SQLite DB

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -3,24 +3,30 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "dev": "next dev",
+    "dev": "ts-node --project tsconfig.server.json server.ts",
     "build": "next build",
-    "start": "next start",
+    "start": "node dist/server.js",
+    "build:server": "tsc --project tsconfig.server.json",
     "lint": "eslint"
   },
   "dependencies": {
+    "better-sqlite3": "^12.10.0",
+    "mqtt": "^5.15.1",
     "next": "16.2.6",
     "react": "19.2.4",
-    "react-dom": "19.2.4"
+    "react-dom": "19.2.4",
+    "recharts": "^3.8.1"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
+    "@types/better-sqlite3": "^7.6.13",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "eslint": "^9",
     "eslint-config-next": "16.2.6",
     "tailwindcss": "^4",
+    "ts-node": "^10.9.2",
     "typescript": "^5"
   }
 }