Scaffold V2 backend foundation

ai_knowledge_base_v2/apps/backend/app/main.py

@@ -0,0 +1,40 @@
+from __future__ import annotations
+
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.router import api_router
+from app.core.config import get_settings
+from app.core.database import create_tables
+from app.core.exception_handlers import register_exception_handlers
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    settings = get_settings()
+    if settings.auto_create_tables:
+        create_tables()
+    yield
+
+
+settings = get_settings()
+
+app = FastAPI(title=settings.app_name, version="0.1.0", lifespan=lifespan)
+register_exception_handlers(app)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.cors_origins,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(api_router, prefix=settings.api_prefix)
+
+
+@app.get("/")
+def root() -> dict[str, str]:
+    return {"name": settings.app_name, "status": "ok"}