feat(v0.4): TUI 系统监控面板 + 插件状态面板

v0.4.1 系统监控面板:
- 复用共享 SystemInfoCollector (TUI + Web面板同一数据源)
- CPU/MEM 彩色进度条 + 网络实时速率
- 2 秒刷新，set_interval 驱动

v0.4.2 插件状态面板:
- 展示已加载插件的名称/版本/命令数
- 3 秒刷新，PluginService 延迟注入

SystemInfoCollector:
- 注册为共享服务 (sys_collector)
- Web panel status.py 优先从 service_manager 获取
- 零重复数据采集

TUI 布局升级: 3行 → 4行 (monitor + log + message + input)

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

services/web_panel/routes/status.py

@@ -47,8 +47,21 @@ async def get_framework(req):
         return web.json_response({"error": "Missing"}, status=500)
     return web.json_response(_get_framework_data(sm))
 
+def _get_collector(req):
+    """获取共享的 SystemInfoCollector（优先从 service_manager），fallback 到模块级实例"""
+    sm = req.app.get('service_manager')
+    if sm:
+        try:
+            shared = sm.get_service("sys_collector")
+            if shared:
+                return shared
+        except Exception:
+            pass
+    return collector
+
 async def get_system(req):
-    return web.json_response(collector.get_all())
+    c = _get_collector(req)
+    return web.json_response(c.get_all())
 
 async def sys_ws_handler(req):
     """WebSocket push endpoint: system+framwork stats every 2s (no logging per message)"""
@@ -60,9 +73,10 @@ async def sys_ws_handler(req):
         """Send one snapshot to this client (silent on error)"""
         try:
             sm = req.app.get('service_manager')
+            c = _get_collector(req)
             payload = json.dumps({
                 "type": "sys",
-                "system": collector.get_all(),
+                "system": c.get_all(),
                 "framework": _get_framework_data(sm)
             }, ensure_ascii=False)
             if not ws.closed: