add architecture skeleton

GymLogAI.Application/Interfaces/IEmbeddingService.cs

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+namespace GymLogAI.Application.Interfaces;
+
+public interface IEmbeddingService
+{
+    Task<float[]> GenerateEmbeddingAsync(string input, CancellationToken cancellationToken);
+}

GymLogAI.Application/Interfaces/IExerciseRepository.cs

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+using GymLogAI.Core.Entities;
+
+namespace GymLogAI.Application.Interfaces;
+
+public interface IExerciseRepository
+{
+    Task<Exercise?> GetByNameAsync(string name, CancellationToken cancellationToken);
+    Task<Exercise> AddAsync(Exercise exercise, CancellationToken cancellationToken);
+    Task<Exercise> UpdateAsync(Exercise exercise, CancellationToken cancellationToken);
+}

GymLogAI.Application/Interfaces/ITelegramMessageRepository.cs

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+using GymLogAI.Core.Entities;
+
+namespace GymLogAI.Application.Interfaces;
+
+public interface ITelegramMessageRepository
+{
+    Task<TelegramMessage> AddAsync(TelegramMessage message, CancellationToken cancellationToken);
+    Task<TelegramMessage?> GetByIdAsync(Guid id, CancellationToken cancellationToken);
+    Task<IReadOnlyCollection<TelegramMessage>> GetPendingAsync(int take, CancellationToken cancellationToken);
+    Task<TelegramMessage> UpdateAsync(TelegramMessage message, CancellationToken cancellationToken);
+}

GymLogAI.Application/Interfaces/IUserRepository.cs

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+using GymLogAI.Core.Entities;
+
+namespace GymLogAI.Application.Interfaces;
+
+public interface IUserRepository
+{
+    Task<User?> GetByIdAsync(Guid id, CancellationToken cancellationToken);
+    Task<User?> GetByTelegramUserIdAsync(long telegramUserId, CancellationToken cancellationToken);
+    Task<User> AddAsync(User user, CancellationToken cancellationToken);
+    Task<User> UpdateAsync(User user, CancellationToken cancellationToken);
+}

GymLogAI.Application/Interfaces/IWorkoutParser.cs

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+using GymLogAI.Application.DTOs;
+
+namespace GymLogAI.Application.Interfaces;
+
+public interface IWorkoutParser
+{
+    Task<ParsedWorkoutDto?> ParseAsync(string text, CancellationToken cancellationToken);
+}

GymLogAI.Application/Interfaces/IWorkoutRecommendationGenerator.cs

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+using GymLogAI.Application.DTOs;
+using GymLogAI.Core.Entities;
+
+namespace GymLogAI.Application.Interfaces;
+
+public interface IWorkoutRecommendationGenerator
+{
+    Task<WorkoutRecommendationDto> GenerateAsync(
+        WorkoutRecommendationContext context,
+        IReadOnlyCollection<Workout> workoutHistory,
+        CancellationToken cancellationToken);
+}

GymLogAI.Application/Interfaces/IWorkoutRepository.cs

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+using GymLogAI.Core.Entities;
+
+namespace GymLogAI.Application.Interfaces;
+
+public interface IWorkoutRepository
+{
+    Task<Workout> AddAsync(Workout workout, CancellationToken cancellationToken);
+    Task<IReadOnlyCollection<Workout>> GetHistoryAsync(Guid userId, CancellationToken cancellationToken);
+}