feat(server): implemente synchronisation et serveur avec fixtures (#187)

- Implémente la couche de synchronisation avec le serveur
- Ajoute les fixtures versionnées pour les tests
- Met à jour Drift database et repositories pour le support sync
- Améliore les tests de synchronisation
- Corrige et améliore le watch companion pour la collecte de métriques

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/infrastructure/local/tables.dart

@@ -804,6 +804,48 @@ class WorkoutTelemetrySamples extends Table {
   ];
 }
 
+class ActiveWorkoutTelemetryWindowStates extends Table {
+  @override
+  String get tableName => 'active_workout_telemetry_window_states';
+
+  TextColumn get sessionId => text().references(
+    ActiveWorkoutSessions,
+    #id,
+    onDelete: KeyAction.cascade,
+  )();
+  IntColumn get windowStartedActiveMs => integer()();
+  DateTimeColumn get latestCapturedAt => dateTime()();
+  IntColumn get programIndex => integer().nullable()();
+  IntColumn get exerciseIndex => integer().nullable()();
+  IntColumn get setIndex => integer().nullable()();
+  IntColumn get passageIndex => integer().nullable()();
+  IntColumn get stepIndex => integer().nullable()();
+  TextColumn get programSnapshotId => text().nullable()();
+  TextColumn get exerciseSnapshotId => text().nullable()();
+  TextColumn get stepSnapshotId => text().nullable()();
+  IntColumn get heartRateBpm => integer().nullable()();
+  RealColumn get distanceMeters => real().nullable()();
+  RealColumn get caloriesKcal => real().nullable()();
+
+  @override
+  Set<Column> get primaryKey => {sessionId};
+
+  @override
+  List<String> get customConstraints => [
+    'CHECK (window_started_active_ms >= 0)',
+    'CHECK (program_index IS NULL OR program_index >= 0)',
+    'CHECK (exercise_index IS NULL OR exercise_index >= 0)',
+    'CHECK (set_index IS NULL OR set_index >= 0)',
+    'CHECK (passage_index IS NULL OR passage_index >= 0)',
+    'CHECK (step_index IS NULL OR step_index >= 0)',
+    'CHECK (heart_rate_bpm IS NULL OR heart_rate_bpm > 0)',
+    'CHECK (distance_meters IS NULL OR distance_meters >= 0)',
+    'CHECK (calories_kcal IS NULL OR calories_kcal >= 0)',
+    'CHECK (heart_rate_bpm IS NOT NULL OR distance_meters IS NOT NULL OR '
+        'calories_kcal IS NOT NULL)',
+  ];
+}
+
 class WorkoutTelemetryAggregates extends Table {
   @override
   String get tableName => 'workout_telemetry_aggregates';