feat(train): the body's figures in a sealed, synced profile (ADR 0030, D33, D34)

A person's profile, one row per person (its ID derived from theirs),
sealed like a workout: sex, birth date, height, weight, resting and
maximum heart rate, VO2max, training background, typical day and sleep
goal, each optional. "Your body" in the account sheet edits it; the
Loop's setup is to reuse its form. The migration only adds the synced
table `profile`, deleted with the person's sync space.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/train/halkyon_train_client/lib/migrations/migration_registry.dart

@@ -5,6 +5,7 @@ library;
 import 'package:serverpod_database/serverpod_database.dart';
 
 part '20261028101012641-workouts/migration.dart';
+part '20261028164640000-profile/migration.dart';
 
 /// Migration registry for the client-side database.
 class MigrationRegistry {
@@ -12,6 +13,7 @@ class MigrationRegistry {
   /// New migrations are always appended at the end.
   static final List<MigrationVersionSql> migrations = [
     _Migration20261028101012641_workouts(),
+    _Migration20261028164640000_profile(),
   ];
 
   /// List of all client-side database migration versions.