add membership features endpoint and use it in mobile

apps/mobile/src/config/api.ts

@@ -44,6 +44,9 @@ export const API_ENDPOINTS = {
     HISTORY: "/api/attendance/history",
   },
   RECOMMENDATIONS: "/api/recommendations",
+  MEMBERSHIP: {
+    FEATURES: "/api/membership/features",
+  },
   NUTRITION: {
     BASE: "/api/nutrition",
     MEALS: "/api/nutrition/meals",