Debug: fix headless mode, plugin compat, psutil optional, module imports

- headless: TUI skip now works correctly
- example_plugin: keyword args compat (plugin_name=, config=, bridge=)
- sysmon: psutil made optional (graceful degrade)
- tui_service: SysMonWidget optional
- All 22 modules import clean, 23 tests pass, integration verified

config/plugins/commands.yaml

@@ -4,10 +4,14 @@ commands:
     permissions:
     - framework.tui.control
     source: internal
-  chat_broadcast: &id001
-    description: 向所有聊天客户端广播消息
+  create-plugin:
+    description: 创建新插件脚手架
     permissions:
-    - plugin.example.chat.broadcast
+    - framework.scaffold.plugin
+    source: internal
+  echo: &id001
+    description: echo input
+    permissions: []
     source: plugin.example_plugin
   help:
     description: 显示帮助信息
@@ -24,15 +28,15 @@ commands:
     permissions:
     - framework.network.diagnose
     source: internal
-  network_info: &id002
-    description: 显示插件网络信息
-    permissions: []
-    source: plugin.example_plugin
   permissions:
     description: '权限管理: 显示权限状态'
     permissions:
     - framework.permission.read
     source: internal
+  plugin_status: &id002
+    description: show plugin status
+    permissions: []
+    source: plugin.example_plugin
   pm_plugin_status:
     description: '权限管理: 查看插件权限状态'
     permissions:
@@ -88,9 +92,9 @@ commands:
     permissions:
     - framework.command.test
     source: internal
-last_updated: 119133.773274654
+last_updated: 248209.227564533
 plugin_commands:
   example_plugin:
-    chat_broadcast: *id001
-    network_info: *id002
-total_commands: 18
+    echo: *id001
+    plugin_status: *id002
+total_commands: 19