refactor: 替换 better-sqlite3 为 libsql 适配器

移除 C++ 原生依赖，Dockerfile 不再需要 python3/make/g++，
构建更快、镜像更轻。

package.json

@@ -9,9 +9,8 @@
     "lint": "eslint"
   },
   "dependencies": {
-    "@prisma/adapter-better-sqlite3": "^7.4.1",
+    "@prisma/adapter-libsql": "^7.4.1",
     "@prisma/client": "^7.4.1",
-    "better-sqlite3": "^12.6.2",
     "framer-motion": "^12.34.3",
     "lucide-react": "^0.575.0",
     "next": "16.1.6",
@@ -20,7 +19,6 @@
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
-    "@types/better-sqlite3": "^7.6.13",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",