feat: 新增 compute_gateway、compute_poller、agent 模块，重构前端 dist

- 新增 backend/app/modules/compute_gateway（client/sync）计算网关模块
- 新增 backend/app/workers/compute_poller 计算轮询 worker
- 新增 compute/agent/process_manager 进程管理器
- 新增 scripts/ 脚本目录
- 更新 Docker 部署配置（app/compute/nginx）
- 更新后端平台 API、数据库 SQL、core 配置
- 更新前端多个视图组件及 API 模块
- 重构 frontend/dist 构建产物（新 hash）
- 更新多项文档

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

backend/app/main.py

@@ -1,9 +1,13 @@
+import asyncio
+from contextlib import suppress
+
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.api.v1.router import api_router
 from app.core.config import get_settings
 from app.core.logging import configure_logging, setup_request_logging
+from app.workers.compute_poller import run_compute_poller
 
 
 def create_app() -> FastAPI:
@@ -20,6 +24,19 @@ def create_app() -> FastAPI:
     )
     setup_request_logging(app)
     app.include_router(api_router, prefix=settings.route_prefix)
+
+    @app.on_event("startup")
+    async def start_workers() -> None:
+        app.state.compute_poller_task = asyncio.create_task(run_compute_poller())
+
+    @app.on_event("shutdown")
+    async def stop_workers() -> None:
+        task = getattr(app.state, "compute_poller_task", None)
+        if task:
+            task.cancel()
+            with suppress(asyncio.CancelledError):
+                await task
+
     return app