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/prisma/schema.prisma

@@ -2,12 +2,14 @@
 // learn more about it in the docs: https://pris.ly/d/prisma-schema
 
 generator client {
-  provider = "prisma-client-js"
+  provider   = "prisma-client"
+  output     = "../src/generated/prisma"
+  engineType = "client"
+  runtime    = "bun"
 }
 
 datasource db {
   provider = "sqlite"
-  url      = "file:./dev.db"
 }
 
 model User {