chore: 统一代码格式并配置开发工具

- 添加 ESLint 和 Prettier 配置以统一代码风格
- 配置项目级 TypeScript 设置
- 更新前后端依赖版本
- 修复代码格式问题（引号、分号、尾随逗号等）
- 优化文件结构和导入路径

backend/package.json

@@ -9,17 +9,24 @@
     "start": "NODE_ENV=production bun src/index.ts",
     "start:dist": "bun run dist/server",
     "build": "bun build --compile --minify-whitespace --minify-syntax --target bun --outfile dist/server src/index.ts",
+    "lint": "eslint .",
+    "lint:fix": "eslint . --fix",
     "typecheck": "bun --bun tsc --noEmit"
   },
   "dependencies": {
-    "elysia": "^1.0.0",
-    "prisma": "^5.0.0",
-    "@prisma/client": "^5.0.0",
-    "better-auth": "^0.7.0",
     "@elysiajs/cors": "^1.0.0",
-    "@elysiajs/eden": "^1.0.0"
+    "@elysiajs/eden": "^1.0.0",
+    "@libsql/client": "^0.17.0",
+    "@prisma/adapter-libsql": "^7.4.2",
+    "@prisma/client": "^7.4.2",
+    "better-auth": "^1.5.4",
+    "dotenv": "^17.3.1",
+    "elysia": "^1.0.0",
+    "prisma": "^7.4.2"
   },
   "devDependencies": {
-    "@types/bun": "latest"
+    "@prisma/config": "^7.4.2",
+    "@types/bun": "latest",
+    "eslint": "^10.0.3"
   }
-}
+}