feat: WebUI 框架设置页面 + API Key 管理 UI

新增:
- static/web_panel/pages/settings.html — API Key CRUD 界面
- 侧边栏 '框架设置' 导航项 (齿轮图标)
- BUILTIN_PAGES 增加 'settings'
- UI 功能: 创建对话框(名称/权限/过期), 列表表格, 一键删除

权限模板:
- readonly — framework.status.read + plugin.info.read
- monitor — + framework.event.subscribe
- full — admin (全部)

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

config/plugins/commands.yaml

@@ -89,6 +89,6 @@ commands:
     permissions:
     - framework.command.test
     source: internal
-last_updated: 13989.462275548
+last_updated: 14102.680173838
 plugin_commands: {}
 total_commands: 18

config/services/network_routes.yaml

@@ -1,4 +1,4 @@
 http_port: 4200
-last_updated: 13989.479860756
+last_updated: 14102.696182483
 plugin_routes: {}
 websocket_port: 4240