app.py

```python
from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from fastapi.middleware.cors import CORSMiddleware
from backend.main import router as api_router

app = FastAPI(title="CryptoSignal-Sleuth")

# CORS configuration
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Mount backend API and frontend static files
app.include_router(api_router, prefix="/api")
app.mount("/", StaticFiles(directory="frontend/dist", html=True), name="frontend")

# For Hugging Face Spaces
def get_app():
    return app
```