Fix tenant register

gateway/app/routes/tenant.py

@@ -12,7 +12,7 @@ from app.core.config import settings
 logger = logging.getLogger(__name__)
 router = APIRouter()
 
-@router.post("/")
+@router.post("/register")
 async def create_tenant(request: Request):
     """Proxy tenant creation to tenant service"""
     try:
@@ -21,7 +21,7 @@ async def create_tenant(request: Request):
         
         async with httpx.AsyncClient(timeout=10.0) as client:
             response = await client.post(
-                f"{settings.TENANT_SERVICE_URL}/tenants",
+                f"{settings.TENANT_SERVICE_URL}/api/v1/tenants/register",
                 content=body,
                 headers={
                     "Content-Type": "application/json",