♻️ Serve frontend from FastAPI (#2393)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

backend/app/main.py

@@ -1,3 +1,5 @@
+from pathlib import Path
+
 import sentry_sdk
 from fastapi import FastAPI
 from fastapi.routing import APIRoute
@@ -6,6 +8,8 @@ from starlette.middleware.cors import CORSMiddleware
 from app.api.main import api_router
 from app.core.config import settings
 
+FRONTEND_DIR = Path(__file__).parent / "frontend"
+
 
 def custom_generate_unique_id(route: APIRoute) -> str:
     return f"{route.tags[0]}-{route.name}"
@@ -31,3 +35,4 @@ if settings.all_cors_origins:
     )
 
 app.include_router(api_router, prefix=settings.API_V1_STR)
+app.frontend("/", directory=FRONTEND_DIR)