Refactor code structure for improved readability and maintainability

Co-authored-by: Copilot <copilot@github.com>

flutter/lib/core/api/api_paths.dart

@@ -28,6 +28,15 @@ class PantryApiPaths {
   static String remove(int id) => '/pantry/$id';
 }
 
+class UserApiPaths {
+  static const me = '/users/me';
+  static const list = '/users';
+  static String setRole(int id) => '/users/$id/role';
+  static String setPremium(int id) => '/users/$id/premium';
+  static String delete(int id) => '/users/$id';
+  static String resetPassword(int id) => '/users/$id/reset-password';
+}
+
 class MealPlanApiPaths {
   static const list = '/meal-plan';