refactor: 完成系统架构升级与模块拆分

本次提交进行了大规模的系统重构：
1. 拆分租户相关模块到platform平台层，重构租户表名与关联关系
2. 迁移日志、工单、插件等模块到对应层级，统一代码结构
3. 重构批量操作接口路径，从/available/setting改为/status/batch
4. 新增批量删除基础模型，统一处理批量操作逻辑
5. 优化导入导出接口，修正路由方法与描述信息
6. 修复循环引用问题，重构依赖注入与类型导入
7. 更新初始化脚本与路由注册，新增平台管理路由
8. 重构岗位模型，新增岗位编码字段与校验
9. 完善部门删除逻辑，新增子部门删除限制
10. 更新初始化数据与配置文件，适配新架构

backend/app/scripts/data/platform_plugin.json

@@ -0,0 +1,67 @@
+[
+  {
+    "name": "代码生成器",
+    "code": "code_generator",
+    "description": "自动生成CRUD代码，支持多种模板",
+    "version": "1.0.0",
+    "author": "FastApiAdmin",
+    "icon": "https://service.fastapiadmin.com/api/v1/static/image/plugin/code.png",
+    "category": "tool",
+    "price": 0,
+    "menu_path": "/tool/generator",
+    "permission_prefix": "tool:generator",
+    "sort": 1
+  },
+  {
+    "name": "AI助手",
+    "code": "ai_assistant",
+    "description": "集成AI对话助手，支持智能问答",
+    "version": "1.0.0",
+    "author": "FastApiAdmin",
+    "icon": "https://service.fastapiadmin.com/api/v1/static/image/plugin/ai.png",
+    "category": "ai",
+    "price": 9900,
+    "menu_path": "/ai/assistant",
+    "permission_prefix": "ai:assistant",
+    "sort": 2
+  },
+  {
+    "name": "系统监控",
+    "code": "system_monitor",
+    "description": "实时监控系统运行状态，CPU、内存、磁盘等",
+    "version": "1.0.0",
+    "author": "FastApiAdmin",
+    "icon": "https://service.fastapiadmin.com/api/v1/static/image/plugin/monitor.png",
+    "category": "monitor",
+    "price": 0,
+    "menu_path": "/monitor/system",
+    "permission_prefix": "monitor:system",
+    "sort": 3
+  },
+  {
+    "name": "工作流引擎",
+    "code": "workflow_engine",
+    "description": "可视化工作流设计器，支持审批流程",
+    "version": "1.0.0",
+    "author": "FastApiAdmin",
+    "icon": "https://service.fastapiadmin.com/api/v1/static/image/plugin/workflow.png",
+    "category": "business",
+    "price": 19900,
+    "menu_path": "/workflow/design",
+    "permission_prefix": "workflow:design",
+    "sort": 4
+  },
+  {
+    "name": "数据大屏",
+    "code": "data_dashboard",
+    "description": "可视化数据大屏，支持多种图表",
+    "version": "1.0.0",
+    "author": "FastApiAdmin",
+    "icon": "https://service.fastapiadmin.com/api/v1/static/image/plugin/dashboard.png",
+    "category": "business",
+    "price": 4900,
+    "menu_path": "/dashboard/data",
+    "permission_prefix": "dashboard:data",
+    "sort": 5
+  }
+]