first commit

Interfaces/IFeedRepository.cs

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+using Fitness_core_BE.Models;
+
+namespace Fitness_core_BE.Interfaces
+{
+    public interface IFeedRepository
+    {
+        Task<FeedPost> GetFeedPostByIdAsync(Guid creatorId, Guid postId);
+        Task<List<FeedPost>> GetFeedListAsync(int skip, int take);
+        Task<bool> IsLikedAsync(Guid postId, Guid userId);
+        Task AddLikeAsync(Guid postId, Guid userId);
+        Task RemoveLikeAsync(Guid postId, Guid userId);
+        Task<object> CreateFeedAsync(FeedPost feedPost, CancellationToken ct = default);
+        Task<int> GetLikeCountAsync(Guid postId);
+        Task<List<FeedPost>> GetFeedByClientAsync(Guid clientId);
+        Task<(Guid? ClientId, List<FeedPost> Posts)> GetFeedForCustomerAsync(
+            Guid customerUserId,
+            int skip,
+            int take,
+            CancellationToken ct = default);
+        Task<object> DeletePostPostIdAsync(Guid creatorId, Guid postId);
+
+        // Resolves a feed poster's user id to the gym (Client) they own, then returns the ids of
+        // all customers with an active subscription at that gym — used to fan out a push
+        // notification to every member when the gym owner creates a post. Returns an empty list
+        // for staff-authored posts or any poster who isn't a Client owner.
+        Task<List<Guid>> GetActiveCustomerIdsByPosterUserIdAsync(Guid posterUserId, CancellationToken ct = default);
+    }
+}