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

services/tui_service.py

@@ -9,7 +9,6 @@ from textual.app import App
 from textual.containers import Container, ScrollableContainer
 from textual.widgets import Static, Input, Header, Footer
 from textual.reactive import reactive
-from services.sysmon_widget import SysMonWidget
 from typing import List, Dict
 import asyncio
 from datetime import datetime
@@ -659,42 +658,6 @@ class TUIFramework(App):
         except Exception as e:
             print(f"❌ 关闭TUI时出错: {str(e)}")
 
-
-    def _start_plugin_status_refresh(self):
-        async def refresh():
-            while True:
-                try:
-                    ps = self.service_manager.get_service("plugin")
-                    if ps and hasattr(ps, "plugin_status"):
-                        lines = []
-                        for name, status in ps.plugin_status.items():
-                            icon = {"running":"🟢","error":"🔴","loading":"🟡","unloaded":"⚫"}.get(str(status),"⚪")
-                            lines.append(f"{icon} {name}: {status}")
-                        widget = self.tui_app.query_one(SysMonWidget)
-                        widget.update_plugins("\n".join(lines) if lines else "无已加载插件")
-                except: pass
-                await asyncio.sleep(3)
-        import asyncio
-        asyncio.create_task(refresh())
-
-
-    def _get_suggester(self):
-        from textual.suggester import Suggester
-        class CmdSuggester(Suggester):
-            async def get_suggestion(self, value):
-                try:
-                    cs = self.app.query_one("#input-area").app
-                    names = ["help","status","history","testlog","netdiag",
-                             "permissions","pmpending","pmhelp","echo","plugin_status",
-                             "scroll","autoscroll","create-plugin","exit","quit"]
-                    if not value: return None
-                    for n in names:
-                        if n.startswith(value) and n != value:
-                            return n
-                except: pass
-                return None
-        return CmdSuggester()
-
 class TuiService:
     """TUI服务"""