first commit

Interfaces/Services/ICustomerPlanService.cs

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+using Microsoft.AspNetCore.Http;
+
+namespace Fitness_core_BE.Interfaces.Services
+{
+    public interface ICustomerPlanService
+    {
+        Task<object> GetAllCustomerPlans(object payload, HttpContext httpContext);
+        Task<object> GetCustomerPlanById(object payload, HttpContext httpContext);
+        Task<object> CreateCustomerPlan(object payload, HttpContext httpContext);
+        Task<object> UpdateCustomerPlan(object payload, HttpContext httpContext);
+
+        /// <summary>Activates or deactivates a plan without touching its configuration.</summary>
+        Task<object> SetCustomerPlanStatus(object payload, HttpContext httpContext);
+
+        Task<object> DeleteCustomerPlan(object payload, HttpContext httpContext);
+    }
+}