refactor: 统一将creator_id重命名为created_id并优化模型关系

feat: 新增系统租户和用户初始化数据

style: 优化代码注释和格式

fix: 修复数据权限检查逻辑中的created_id字段判断

perf: 移除不必要的模型关系以提升性能

docs: 更新初始化数据的描述信息

chore: 清理废弃文件和冗余代码

backend/app/scripts/data/system_user.json

@@ -0,0 +1,26 @@
+[
+  {
+    "username": "admin",
+    "password": "$2b$12$e2IJgS/cvHgJ0H3G7Xa08OXoXnk6N/NX3IZRtubBDElA0VLZhkNOa",
+    "name": "超级管理员",
+    "mobile": null,
+    "email": null,
+    "gender": "0",
+    "avatar": "https://service.fastapiadmin.com/api/v1/static/image/avatar.png",
+    "is_superuser": true,
+    "last_login": null,
+    "gitee_login": null,
+    "github_login": null,
+    "wx_login": null,
+    "qq_login": null,
+    "user_type": "0",
+    "salt": "123456",
+    "dept_id": 1,
+    "status": true,
+    "description": "超级管理员",
+    "tenant_id": 1,
+    "customer_id": null,
+    "created_id": null,
+    "updated_id": null
+  }
+]