feat(backend): added auth, reviews, users modules

also provided tests

src/backend/api/v1/router.py

@@ -7,6 +7,9 @@ from ninja import NinjaAPI, Schema
 from ninja.renderers import BaseRenderer
 
 from api.v1 import handlers
+from api.v1.auth.endpoints import router as auth_router
+from api.v1.reviews.endpoints import router as reviews_router
+from api.v1.users.endpoints import router as users_router
 
 
 class ORJSONRenderer(BaseRenderer):
@@ -33,10 +36,20 @@ router = NinjaAPI(
 )
 
 
-# router.add_router(
-#     "health",
-#     health_router,
-# )
+router.add_router(
+    "auth",
+    auth_router,
+)
+
+router.add_router(
+    "users",
+    users_router,
+)
+
+router.add_router(
+    "reviews",
+    reviews_router,
+)
 
 
 for exception, handler in handlers.exception_handlers: