整理数据库迁移文件和开发脚本

- 合并迁移文件为 000001_init.sql（表结构）和 000002_seed.sql（初始数据）
- 删除旧的迁移文件（000002_chat.sql、000002_rbac_seed.sql、000007_chat_enhancements.sql）
- 简化 dev.sh 迁移逻辑，移除对已删除文件的引用
- 添加聊天相关表（chat_quick_replies）到初始化脚本

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/migrations/000001_init.sql

@@ -1,3 +1,15 @@
+-- ============================================
+-- 数据库初始化脚本
+-- 包含所有表结构定义
+-- ============================================
+
+SET NAMES utf8mb4;
+SET FOREIGN_KEY_CHECKS = 0;
+
+-- -------------------------------------------
+-- 用户相关表
+-- -------------------------------------------
+
 CREATE TABLE users (
   id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
   phone VARCHAR(32) NOT NULL,
@@ -29,6 +41,10 @@ CREATE TABLE user_realname (
   KEY idx_user_realname_provider_order_no (provider_order_no)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
+-- -------------------------------------------
+-- 游戏账号和商品表
+-- -------------------------------------------
+
 CREATE TABLE game_accounts (
   id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
   owner_id BIGINT UNSIGNED NOT NULL,
@@ -67,6 +83,10 @@ CREATE TABLE rental_listings (
   KEY idx_rental_listings_filter (status, review_status, in_transaction, price)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
+-- -------------------------------------------
+-- 订单相关表
+-- -------------------------------------------
+
 CREATE TABLE rental_orders (
   id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
   order_no VARCHAR(64) NOT NULL,
@@ -136,6 +156,10 @@ CREATE TABLE handoff_records (
   KEY idx_handoff_records_order_id (order_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
+-- -------------------------------------------
+-- 钱包相关表
+-- -------------------------------------------
+
 CREATE TABLE wallet_accounts (
   id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
   user_id BIGINT UNSIGNED NOT NULL,
@@ -166,6 +190,10 @@ CREATE TABLE wallet_ledger (
   KEY idx_wallet_ledger_biz (biz_type, biz_no)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
+-- -------------------------------------------
+-- 纠纷和通知表
+-- -------------------------------------------
+
 CREATE TABLE disputes (
   id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
   order_id BIGINT UNSIGNED NOT NULL,
@@ -213,6 +241,10 @@ CREATE TABLE audit_logs (
   KEY idx_audit_logs_biz (biz_type, biz_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
+-- -------------------------------------------
+-- 管理员和权限表
+-- -------------------------------------------
+
 CREATE TABLE admin_users (
   id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
   username VARCHAR(64) NOT NULL,
@@ -262,6 +294,10 @@ CREATE TABLE role_permissions (
   UNIQUE KEY uk_role_permissions_role_permission (role_id, permission_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
+-- -------------------------------------------
+-- 系统配置表
+-- -------------------------------------------
+
 CREATE TABLE system_configs (
   id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
   `key` VARCHAR(128) NOT NULL,
@@ -272,3 +308,65 @@ CREATE TABLE system_configs (
   updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   UNIQUE KEY uk_system_configs_key (`key`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- -------------------------------------------
+-- 客服聊天表
+-- -------------------------------------------
+
+CREATE TABLE chat_conversations (
+  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
+  order_id BIGINT UNSIGNED NOT NULL,
+  type VARCHAR(32) NOT NULL DEFAULT 'order_group',
+  title VARCHAR(128) NOT NULL,
+  status VARCHAR(32) NOT NULL DEFAULT 'active',
+  last_message_id BIGINT UNSIGNED NULL,
+  last_message_preview VARCHAR(255) NOT NULL DEFAULT '',
+  last_message_at DATETIME NULL,
+  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  UNIQUE KEY uk_chat_conversations_order_id (order_id),
+  KEY idx_chat_conversations_last_message_at (last_message_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE chat_participants (
+  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
+  conversation_id BIGINT UNSIGNED NOT NULL,
+  participant_type VARCHAR(16) NOT NULL,
+  participant_id BIGINT UNSIGNED NOT NULL,
+  role VARCHAR(32) NOT NULL,
+  remark VARCHAR(128) NOT NULL DEFAULT '',
+  last_read_at DATETIME NULL,
+  joined_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  UNIQUE KEY uk_chat_participants_member (conversation_id, participant_type, participant_id),
+  KEY idx_chat_participants_participant (participant_type, participant_id),
+  KEY idx_chat_participants_conversation (conversation_id)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE chat_messages (
+  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
+  conversation_id BIGINT UNSIGNED NOT NULL,
+  sender_type VARCHAR(16) NOT NULL,
+  sender_id BIGINT UNSIGNED NOT NULL DEFAULT 0,
+  sender_role VARCHAR(32) NOT NULL DEFAULT '',
+  content_type VARCHAR(32) NOT NULL DEFAULT 'text',
+  content TEXT NULL,
+  attachment_urls JSON NULL,
+  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  KEY idx_chat_messages_conversation_id (conversation_id, id),
+  KEY idx_chat_messages_created_at (created_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE chat_quick_replies (
+  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
+  admin_user_id BIGINT UNSIGNED NOT NULL DEFAULT 0 COMMENT '0=全局, >0=个人',
+  title VARCHAR(64) NOT NULL COMMENT '快捷回复标题',
+  content TEXT NOT NULL COMMENT '回复内容',
+  sort_order INT NOT NULL DEFAULT 0 COMMENT '排序',
+  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  INDEX idx_admin_user_id (admin_user_id)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='快捷回复模板';
+
+SET FOREIGN_KEY_CHECKS = 1;