add architecture skeleton

GymLogAI.API/Contracts/ImportTelegramMessageRequest.cs

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+namespace GymLogAI.API.Contracts;
+
+public sealed record ImportTelegramMessageRequest(
+    Guid UserId,
+    long TelegramUserId,
+    long TelegramChatId,
+    int TelegramMessageId,
+    string Text,
+    DateTime SentAtUtc,
+    string? Username,
+    string? FirstName,
+    string? LastName);
+
+public sealed record ImportTelegramMessageResponse(Guid MessageId);

GymLogAI.API/Contracts/RecommendWorkoutRequest.cs

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+using GymLogAI.Core.Enums;
+
+namespace GymLogAI.API.Contracts;
+
+public sealed record RecommendWorkoutRequest(
+    Guid UserId,
+    GoalType GoalType,
+    string? AdditionalContext);

GymLogAI.API/Contracts/WorkoutHistoryResponses.cs

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+namespace GymLogAI.API.Contracts;
+
+public sealed record WorkoutHistoryItemResponse(
+    Guid Id,
+    DateTime PerformedAtUtc,
+    string? Title,
+    string? Notes,
+    IReadOnlyCollection<WorkoutHistoryExerciseResponse> Exercises);
+
+public sealed record WorkoutHistoryExerciseResponse(
+    Guid ExerciseId,
+    string Name,
+    int Order,
+    string? Notes,
+    IReadOnlyCollection<WorkoutHistorySetResponse> Sets);
+
+public sealed record WorkoutHistorySetResponse(
+    int Order,
+    int? Repetitions,
+    decimal? WeightKg,
+    int? DurationSeconds,
+    decimal? DistanceMeters,
+    string? Notes);