security: Sentinel 路由鉴权 + API Key CSRF + SSRF 防护

修复:
- Sentinel 路由 require_auth=False → True (严重: 未认证可访问)
- API Key 创建/删除加 csrf_protect=True
- SSRF 防护: 测试连接仅允许 http/https scheme
- 插件网络鉴权: 已加载插件自动放行 (不再要求 plugin.network.access)
- Sentinel 权限列表补充 plugin.network.access

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

config/plugins/commands.yaml

@@ -79,6 +79,10 @@ commands:
     permissions:
     - framework.tui.control
     source: internal
+  sentinel: &id001
+    description: Sentinel 集群状态
+    permissions: []
+    source: plugin.sentinel
   status:
     description: 显示框架状态
     permissions:
@@ -89,6 +93,8 @@ commands:
     permissions:
     - framework.command.test
     source: internal
-last_updated: 14102.680173838
-plugin_commands: {}
-total_commands: 18
+last_updated: 16793.516549165
+plugin_commands:
+  sentinel:
+    sentinel: *id001
+total_commands: 19