fix:修复项目结构

backend/app/main.py

@@ -0,0 +1,43 @@
+import logging
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.config import settings
+from app.database import Base, engine, SessionLocal
+from app.models import HTMLFile
+from app.routers import html
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
+)
+logger = logging.getLogger(__name__)
+
+Base.metadata.create_all(bind=engine)
+
+# 删除过期记录
+db = SessionLocal()
+try:
+    deleted_count = HTMLFile.delete_expired_records(db)
+    if deleted_count > 0:
+        logger.info(f"Deleted {deleted_count} expired HTML file records")
+finally:
+    db.close()
+
+app = FastAPI(title=settings.app_name)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.allowed_origins,
+    allow_credentials=False,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(html.router, prefix=settings.api_prefix)
+
+
+@app.get("/")
+def health_check() -> dict[str, str]:
+    return {"message": "HTML Generator API is running"}