feat: 完善企业场景多线路由与执行稳定性

补齐平台模板与场景 DSL、预算控制、执行看板和企业场景脚本，增强 Windows 启动/迁移与前端代理和聊天会话记忆，修复执行创建阶段 500 与异步链路排障体验。

Made-with: Cursor

backend/scripts/templates/template_dev_codegen.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+"""
+路线图场景模板：研发 / 代码助手 — 通过 API 从模板创建 Agent。
+
+用法:
+  cd backend && .\\venv\\Scripts\\python.exe scripts/templates/template_dev_codegen.py
+"""
+from __future__ import annotations
+
+import os
+import sys
+import time
+
+import requests
+
+BASE = os.getenv("PLATFORM_BASE_URL", "http://127.0.0.1:8037").rstrip("/")
+USER = os.getenv("PLATFORM_USERNAME", "admin")
+PWD = os.getenv("PLATFORM_PASSWORD", "123456")
+TEMPLATE_ID = "template_dev_codegen"
+DEFAULT_NAME = os.getenv("TARGET_NAME") or f"场景模板_研发_{int(time.time())}"
+
+
+def main() -> int:
+    r = requests.post(
+        f"{BASE}/api/v1/auth/login",
+        data={"username": USER, "password": PWD},
+        headers={"Content-Type": "application/x-www-form-urlencoded"},
+        timeout=15,
+    )
+    if r.status_code != 200:
+        print("登录失败:", r.status_code, r.text[:500], file=sys.stderr)
+        return 1
+    token = r.json().get("access_token")
+    if not token:
+        print("无 access_token", file=sys.stderr)
+        return 1
+    h = {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}
+
+    body = {
+        "template_id": TEMPLATE_ID,
+        "name": DEFAULT_NAME,
+        "description": "由 scripts/templates/template_dev_codegen.py 创建",
+        "parameters": {"preferred_language": "Python", "temperature": 0.25},
+    }
+    cr = requests.post(f"{BASE}/api/v1/agents/from-scene-template", json=body, headers=h, timeout=60)
+    if cr.status_code not in (200, 201):
+        print("创建失败:", cr.status_code, cr.text[:800], file=sys.stderr)
+        return 1
+    print(cr.json().get("id"), cr.json().get("name"))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())