Make Apple Health workout recording watch-only

The phone no longer writes estimated Health workouts: the watch, which
runs the live session, is the sole recorder. Replaces WorkoutHealthWriter
with a WorkoutHealthDeleter that only removes a legacy phone-estimate
workout when its record is deleted here, drops the MET calorie table and
the phone's write/read Health scopes, and keeps phoneEstimate decodable
for existing documents.

Claude-Session: https://claude.ai/code/session_01HJDQQDA9QdP8zByg43H5v3

Workouts/Views/WorkoutLogs/WorkoutLogsView.swift

@@ -94,7 +94,7 @@ struct WorkoutLogsView: View {
                 // the UUID before the delete prunes the cache entity.
                 if let healthUUID = workout.metricHealthKitWorkoutUUID {
                     Button("Delete + Remove from Apple Health", role: .destructive) {
-                        services.workoutHealthWriter.deleteFromHealth(uuidString: healthUUID)
+                        services.workoutHealthDeleter.deleteFromHealth(uuidString: healthUUID)
                         Task { await sync.delete(workout: workout) }
                         itemToDelete = nil
                     }