refactor: 移除多租户和客户相关代码及功能

refactor: 统一状态字段为字符串类型并更新相关组件
refactor: 更新模型基类移除租户和客户相关字段
refactor: 简化数据权限控制逻辑
refactor: 优化类型注解使用Python 3.10+语法
refactor: 清理无用导入和注释
docs: 更新文档移除多租户相关内容

backend/app/scripts/data/sys_role.json

@@ -4,9 +4,18 @@
     "code": "ADMIN",
     "status": "0",
     "order": 1,
-    "data_scope": "4",
+    "data_scope": 4,
+    "description": "初始化角色",
+    "created_id": 1,
+    "updated_id": 1
+  },
+  {
+    "name": "普通角色",
+    "code": "COMMON",
+    "status": "0",
+    "order": 1,
+    "data_scope": 3,
     "description": "初始化角色",
-    "tenant_id": 1,
     "created_id": 1,
     "updated_id": 1
   }