security: P3 — 插件隔离默认开启 + SenSuDB 注册 + 审计日志

- plugins.isolation 默认 true (生产环境进程隔离)
- main.py 注册 SenSuDB 服务
- WebPanelManager 注入 sensu_db 到 app context
- 文件删除/写入操作写入审计日志 (audit_log 表)
- 修复 Session 持久化所需的数据库依赖

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

config/services/network_routes.yaml

@@ -1,17 +1,4 @@
 http_port: 4200
-last_updated: 12019.877017393
-plugin_routes:
-  example_plugin:
-  - methods:
-    - GET
-    path: /example_plugin/api/example/info
-    require_auth: false
-  - methods:
-    - POST
-    path: /example_plugin/api/plugin/echo
-    require_auth: true
-  - methods:
-    - POST
-    path: /example_plugin/api/plugin/plugin_status
-    require_auth: true
+last_updated: 12161.450926401
+plugin_routes: {}
 websocket_port: 4240