feat: 增强插件管理和连接稳定性，添加会话令牌重置和组件清理功能

src/plugin_runtime/host/component_registry.py

@@ -93,6 +93,14 @@ class ComponentRegistry:
         comp = RegisteredComponent(name, component_type, plugin_id, metadata)
         if comp.full_name in self._components:
             logger.warning(f"组件 {comp.full_name} 已存在，覆盖")
+            # 从 _by_plugin 列表中移除旧条目，防止幽灵组件堆积
+            old_comp = self._components[comp.full_name]
+            old_list = self._by_plugin.get(old_comp.plugin_id)
+            if old_list is not None:
+                try:
+                    old_list.remove(old_comp)
+                except ValueError:
+                    pass
 
         self._components[comp.full_name] = comp