Init first files

backend/app/api/routes/health.py

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+from fastapi import APIRouter
+from sqlalchemy import text
+from app.core.db import SessionLocal
+
+router = APIRouter()
+
+
+@router.get("/healthz")
+async def healthz() -> dict:
+    return {"status": "ok"}
+
+
+@router.get("/readyz")
+async def readyz() -> dict:
+    async with SessionLocal() as session:
+        await session.execute(text("SELECT 1"))
+    return {"status": "ready"}