Add role-based filtering and imporve code

gateway/app/routes/subscription.py

@@ -26,13 +26,13 @@ async def proxy_subscription_endpoints(request: Request, tenant_id: str = Path(.
 @router.api_route("/subscriptions/plans", methods=["GET", "OPTIONS"])
 async def proxy_subscription_plans(request: Request):
     """Proxy subscription plans request to tenant service"""
-    target_path = "/api/v1/plans"
+    target_path = "/plans"
     return await _proxy_to_tenant_service(request, target_path)
 
 @router.api_route("/plans", methods=["GET", "OPTIONS"])
 async def proxy_plans(request: Request):
     """Proxy plans request to tenant service"""
-    target_path = "/api/v1/plans"
+    target_path = "/plans"
     return await _proxy_to_tenant_service(request, target_path)
 
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