feat(backend): Agent 系统和 API 增强

- task_delegator: 完善团队任务分发逻辑
- runtime API: 增强运行时管理功能
- skills_manager: 技能管理改进
- tool_guard: 工具调用守卫优化
- evo_agent: 核心 Agent 改进

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/agents/base/evo_agent.py

@@ -470,7 +470,7 @@ class EvoAgent(ToolGuardMixin, ReActAgent):
         """
         return self._messenger
 
-    def delegate_task(
+    async def delegate_task(
         self,
         task_type: str,
         task_data: Dict[str, Any],
@@ -493,7 +493,7 @@ class EvoAgent(ToolGuardMixin, ReActAgent):
             }
 
         try:
-            return self._task_delegator.delegate_task(
+            return await self._task_delegator.delegate_task(
                 task_type=task_type,
                 task_data=task_data,
                 target_agent=target_agent,