refactor: 系统权限模块重构，迁移至PostgreSQL并对齐新设计

- 切换数据库为PostgreSQL，更新依赖与配置
- 重构权限体系，使用sys_user/sys_role/sys_menu等新实体替代旧模型
- 移除旧的用户角色/权限/系统设置相关代码与实体
- 新增字典、菜单管理模块与基础CRUD接口
- 优化鉴权逻辑，基于菜单权限标识进行接口校验
- 前端同步更新API、路由与权限控制逻辑
- 删除冗余的v-permission指令与相关代码

server/package.json

@@ -19,13 +19,14 @@
 		"@midwayjs/validate": "^3.19.0",
 		"@types/validator": "^13.15.10",
 		"bcryptjs": "^2.4.3",
-		"cache-manager-ioredis": "^2.1.5",
+		"cache-manager-ioredis": "^2.1.0",
 		"class-transformer": "^0.5.1",
 		"class-validator": "^0.14.1",
 		"dayjs": "^1.11.13",
 		"ioredis": "^5.4.1",
 		"jsonwebtoken": "^9.0.2",
-		"mysql2": "^3.12.0",
+		"pg": "^8.11.0",
+		"pg-hstore": "^2.3.4",
 		"reflect-metadata": "^0.2.2",
 		"sequelize": "^6.37.5",
 		"sequelize-typescript": "^2.1.6",