feat: 用户信息完善 + 一起记功能

- users 表添加 nickname、avatar_url 字段
- 用户信息 API（GET/PUT /me）+ 头像上传（multer）
- 头像通过 API 路由获取（公开，不经过 auth）
- 登录接口返回用户昵称和头像
- 用户信息 Store + 个人资料编辑页面
- 我的页面和首页显示真实用户信息
- 群组表（groups、group_members）+ transactions 添加 group_id
- 群组 API（创建/加入/退出/解散）
- 交易和统计 API 支持 group_id 视图切换
- 群组客户端 Store + 身份切换
- 群组管理页面
- App 初始化群组 Store
- UPLOAD_DIR 配置化
- Node.js 备份替代 mysqldump
- 统一前端 BASE_URL（config.ts）
- uploads 加入 .gitignore
- 修复 trust proxy 警告

server/src/db/schema.sql

@@ -2,6 +2,8 @@ CREATE TABLE IF NOT EXISTS users (
   id INT AUTO_INCREMENT PRIMARY KEY,
   openid VARCHAR(100) UNIQUE,
   session_key VARCHAR(100),
+  nickname VARCHAR(50) DEFAULT '小菜' COMMENT '用户昵称',
+  avatar_url VARCHAR(500) DEFAULT '' COMMENT '头像URL',
   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
   updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
@@ -28,10 +30,12 @@ CREATE TABLE IF NOT EXISTS transactions (
   category_id INT,
   note VARCHAR(200),
   date DATE NOT NULL,
+  group_id INT DEFAULT NULL COMMENT '群组标签，NULL=纯个人记录',
   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
   updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   INDEX idx_user_date (user_id, date),
   INDEX idx_user_type_date (user_id, type, date),
+  INDEX idx_group_date (group_id, date),
   FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
   FOREIGN KEY (category_id) REFERENCES categories(id) ON DELETE SET NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
@@ -46,3 +50,25 @@ CREATE TABLE IF NOT EXISTS budgets (
   UNIQUE KEY uk_user_month (user_id, month),
   FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+CREATE TABLE IF NOT EXISTS `groups` (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  name VARCHAR(100) NOT NULL COMMENT '群组名称',
+  invite_code VARCHAR(10) UNIQUE NOT NULL COMMENT '邀请码',
+  created_by INT NOT NULL COMMENT '创建者',
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  FOREIGN KEY (created_by) REFERENCES users(id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+CREATE TABLE IF NOT EXISTS group_members (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  group_id INT NOT NULL,
+  user_id INT NOT NULL,
+  role ENUM('owner', 'member') DEFAULT 'member' COMMENT '角色',
+  nickname VARCHAR(50) DEFAULT '' COMMENT '群内昵称',
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  UNIQUE KEY uk_group_user (group_id, user_id),
+  FOREIGN KEY (group_id) REFERENCES `groups`(id) ON DELETE CASCADE,
+  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;