fix: 修复Agent执行历史为空的问题

- 在Agent初始化时添加示例执行历史
- 添加触发示例动作和清空历史的功能
- 完善Agent执行历史的显示界面
- 添加执行历史的操作按钮（触发示例、刷新、清空）
- 优化执行历史的显示格式，包括优先级、置信度、执行时间等
- 修复前端Agent数据加载逻辑

src/web/app.py

@@ -344,6 +344,51 @@ def get_agent_status():
     except Exception as e:
         return jsonify({"error": str(e)}), 500
 
+@app.route('/api/agent/action-history')
+def get_agent_action_history():
+    """获取Agent动作执行历史"""
+    try:
+        limit = request.args.get('limit', 50, type=int)
+        history = agent_assistant.get_action_history(limit)
+        return jsonify({
+            "success": True,
+            "history": history,
+            "count": len(history)
+        })
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
+@app.route('/api/agent/trigger-sample', methods=['POST'])
+def trigger_sample_action():
+    """触发示例动作"""
+    try:
+        import asyncio
+        result = asyncio.run(agent_assistant.trigger_sample_actions())
+        return jsonify(result)
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
+@app.route('/api/agent/clear-history', methods=['POST'])
+def clear_agent_history():
+    """清空Agent执行历史"""
+    try:
+        result = agent_assistant.clear_execution_history()
+        return jsonify(result)
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
+@app.route('/api/agent/llm-stats')
+def get_llm_stats():
+    """获取LLM使用统计"""
+    try:
+        stats = agent_assistant.get_llm_usage_stats()
+        return jsonify({
+            "success": True,
+            "stats": stats
+        })
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
 @app.route('/api/agent/toggle', methods=['POST'])
 def toggle_agent_mode():
     """切换Agent模式"""