feat: 脚本执行平台功能

- 支持 Python 脚本定时执行（类似青龙面板）
- 内置 SDK：AI大模型、钉钉/企微通知、数据库查询、HTTP请求、变量存储
- 安全沙箱执行，禁用危险模块
- 前端脚本编辑器，支持测试执行
- SDK 文档查看
- 日志通过 TraceID 与 platform_logs 关联

backend/app/services/scheduler.py

@@ -69,26 +69,64 @@ async def execute_task(task_id: int):
         result = db.execute(text("SELECT LAST_INSERT_ID() as id"))
         log_id = result.scalar()
         
-        # 4. 调用 webhook
-        webhook_url = task["webhook_url"]
-        input_params = task["input_params"] or {}
+        # 生成 trace_id
+        trace_id = f"task_{task_id}_{datetime.now().strftime('%Y%m%d%H%M%S%f')}"
         
-        async with httpx.AsyncClient(timeout=300.0) as client:
-            response = await client.post(
-                webhook_url,
-                json=input_params,
-                headers={"Content-Type": "application/json"}
-            )
+        # 4. 根据执行类型分发
+        execution_type = task.get("execution_type", "webhook")
+        
+        if execution_type == "script":
+            # 脚本执行模式
+            from .script_executor import execute_script as run_script
             
-            response_code = response.status_code
-            response_body = response.text[:5000] if response.text else ""  # 限制存储长度
-            
-            if response.is_success:
-                status = "success"
-                error_message = None
-            else:
+            script_content = task.get("script_content", "")
+            if not script_content:
                 status = "failed"
-                error_message = f"HTTP {response_code}"
+                error_message = "脚本内容为空"
+                response_code = None
+                response_body = ""
+            else:
+                script_result = await run_script(
+                    task_id=task_id,
+                    tenant_id=task["tenant_id"],
+                    script_content=script_content,
+                    trace_id=trace_id
+                )
+                
+                if script_result.success:
+                    status = "success"
+                    error_message = None
+                else:
+                    status = "failed"
+                    error_message = script_result.error
+                
+                response_code = None
+                response_body = script_result.output[:5000] if script_result.output else ""
+                
+                # 添加日志到响应体
+                if script_result.logs:
+                    response_body += "\n\n--- 执行日志 ---\n" + "\n".join(script_result.logs[-20:])
+        else:
+            # Webhook 执行模式
+            webhook_url = task["webhook_url"]
+            input_params = task["input_params"] or {}
+            
+            async with httpx.AsyncClient(timeout=300.0) as client:
+                response = await client.post(
+                    webhook_url,
+                    json=input_params,
+                    headers={"Content-Type": "application/json"}
+                )
+                
+                response_code = response.status_code
+                response_body = response.text[:5000] if response.text else ""  # 限制存储长度
+                
+                if response.is_success:
+                    status = "success"
+                    error_message = None
+                else:
+                    status = "failed"
+                    error_message = f"HTTP {response_code}"
         
         # 5. 更新执行日志
         db.execute(