add architecture skeleton

GymLogAI.Application/DTOs/ParsedExerciseDto.cs

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+namespace GymLogAI.Application.DTOs;
+
+public sealed record ParsedExerciseDto(
+    string Name,
+    int Order,
+    string? Notes,
+    IReadOnlyCollection<ParsedExerciseSetDto> Sets);

GymLogAI.Application/DTOs/ParsedExerciseSetDto.cs

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+namespace GymLogAI.Application.DTOs;
+
+public sealed record ParsedExerciseSetDto(
+    int Order,
+    int? Repetitions,
+    decimal? WeightKg,
+    int? DurationSeconds,
+    decimal? DistanceMeters,
+    string? Notes);

GymLogAI.Application/DTOs/ParsedWorkoutDto.cs

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+namespace GymLogAI.Application.DTOs;
+
+public sealed record ParsedWorkoutDto(
+    DateTime PerformedAtUtc,
+    string? Title,
+    string? Notes,
+    IReadOnlyCollection<ParsedExerciseDto> Exercises);

GymLogAI.Application/DTOs/WorkoutRecommendationContext.cs

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+using GymLogAI.Core.Enums;
+
+namespace GymLogAI.Application.DTOs;
+
+public sealed record WorkoutRecommendationContext(
+    Guid UserId,
+    GoalType GoalType,
+    string? AdditionalContext);

GymLogAI.Application/DTOs/WorkoutRecommendationDto.cs

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+namespace GymLogAI.Application.DTOs;
+
+public sealed record WorkoutRecommendationDto(
+    string Title,
+    string Summary,
+    IReadOnlyCollection<string> Exercises,
+    string RecoveryAdvice);