feat: 订单模块 v0.1 实现与样板二维平面图全量采集

- 后端分层架构: api(Controller)/services(业务)/repositories(数据)/models(ORM)
- 订单模块: 创建(契约对齐目标站{contract_id,drawing_data,pic_url})、搜索、
  详情、更新、删除、状态机(意向单→正式单→生产中→完工/取消,非法迁移拒绝)、
  7节点生产进度、审计日志
- 认证模块: JWT签发(HS256/24h)、PBKDF2密码、注册登录
- 样板库API: 分类树/模板搜索/模板详情, drawing_data 与采集样本同构
- 254张样板二维平面图全部采集并静态挂载 /static/windoor-images/
- 种子脚本: 管理员+分类树+254套样板入库
- 统一响应envelope与付费墙(code=10086)/权限(code=210)语义
- 端到端冒烟测试7/7通过, 更新API.md §12自研接口规范

src/huamenchuang/main.py

@@ -0,0 +1,73 @@
+"""应用入口：FastAPI 装配、异常处理、静态资源挂载、开发服务器。"""
+from pathlib import Path
+
+from fastapi import FastAPI, Request
+from fastapi.exceptions import RequestValidationError
+from fastapi.staticfiles import StaticFiles
+
+from huamenchuang.api.router import api_router
+from huamenchuang.core.database import init_db
+from huamenchuang.core.deps import ModuleLockedError, NotAuthedError
+from huamenchuang.core.response import fail, ok, paywall
+
+app = FastAPI(title="华门窗云平台", version="0.1.0")
+
+
+@app.on_event("startup")
+async def startup() -> None:
+    await init_db()
+
+
+@app.exception_handler(NotAuthedError)
+async def auth_handler(request: Request, exc: NotAuthedError):
+    return _json({"code": 401, "message": str(exc), "data": "", "other_data": "", "other_data2": ""})
+
+
+@app.exception_handler(ModuleLockedError)
+async def module_locked_handler(request: Request, exc: ModuleLockedError):
+    return _json(paywall(exc.module))
+
+
+@app.exception_handler(RequestValidationError)
+async def validation_handler(request: Request, exc: RequestValidationError):
+    """参数校验失败 → 422 语义 envelope（列出字段，不泄漏内部细节）。"""
+    fields = [f"{'.'.join(str(x) for x in e['loc'][1:])}" for e in exc.errors()]
+    return _json(fail(f"参数错误: {', '.join(fields)}"))
+
+
+@app.exception_handler(Exception)
+async def unhandled_handler(request: Request, exc: Exception):
+    """兜底异常：统一 500 envelope（不回栈信息）。"""
+    return _json(fail("服务器内部错误,请稍后再试"))
+
+
+def _json(payload: dict):
+    from fastapi.responses import JSONResponse
+    return JSONResponse(payload)
+
+
+@api_router.get("/health", tags=["系统"])
+async def health():
+    return ok(data={"status": "up"}, message="ok")
+
+
+app.include_router(api_router)
+
+# 静态资源：样板平面图（data/windoor-images）
+_imgdir = Path(__file__).resolve().parents[2] / "data" / "windoor-images"
+if _imgdir.exists():
+    app.mount("/static/windoor-images", StaticFiles(directory=str(_imgdir)), name="windoor-images")
+
+# 前端构建产物挂载（前后端规范：构建到后端目录）
+_dist = Path(__file__).resolve().parents[2] / "frontend" / "dist"
+if _dist.exists():
+    app.mount("/", StaticFiles(directory=str(_dist), html=True), name="frontend")
+
+
+def main() -> None:
+    import uvicorn
+    uvicorn.run("huamenchuang.main:app", host="0.0.0.0", port=8000, reload=True)
+
+
+if __name__ == "__main__":
+    main()