feat: add API key authentication and health endpoint

src/backend/api/dependencies.py

@@ -0,0 +1,8 @@
+from fastapi import Header, HTTPException
+
+from src.backend.config import settings
+
+
+async def verify_api_key(x_api_key: str | None = Header(default=None)):
+    if x_api_key is None or x_api_key != settings.api_key:
+        raise HTTPException(status_code=403, detail="API key non valida")

src/backend/api/routes/health.py

@@ -0,0 +1,11 @@
+from fastapi import APIRouter, Depends
+
+from src.backend.api.dependencies import verify_api_key
+from src.backend.models.api import ok
+
+router = APIRouter(dependencies=[Depends(verify_api_key)])
+
+
+@router.get("/health", summary="Health check", tags=["system"])
+async def health():
+    return ok({"status": "running"})

src/backend/main.py

@@ -0,0 +1,17 @@
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+
+from src.backend.api.routes.health import router as health_router
+from src.backend.db.database import init_db
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    await init_db()
+    yield
+
+
+app = FastAPI(title="OpusAgent", version="0.1.0", lifespan=lifespan)
+
+app.include_router(health_router, prefix="/api")