feat: endpoint GET /api/health + tests

Implémentation TDD : test écrit en premier (phase rouge), puis
app.main, app.api.health et app.api.media créés pour le faire passer.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/api/health.py

@@ -0,0 +1,8 @@
+from fastapi import APIRouter
+
+router = APIRouter()
+
+
+@router.get("/health")
+async def health():
+    return {"status": "ok"}

backend/app/api/media.py

@@ -0,0 +1,3 @@
+from fastapi import APIRouter
+
+router = APIRouter()

backend/app/main.py

@@ -0,0 +1,18 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from app.api.health import router as health_router
+from app.api.media import router as media_router
+from app.core.config import settings
+
+app = FastAPI(title="HomeHub API", version="0.1.0")
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.cors_origins_list,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(health_router, prefix="/api")
+app.include_router(media_router, prefix="/api/media")

backend/tests/conftest.py

@@ -0,0 +1,9 @@
+import pytest
+from httpx import AsyncClient, ASGITransport
+from app.main import app
+
+
+@pytest.fixture
+async def client():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
+        yield ac

backend/tests/test_health.py

@@ -0,0 +1,4 @@
+async def test_health_retourne_ok(client):
+    response = await client.get("/api/health")
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok"}