feat(enakgame): filter play history by game and status

GET /customer/enakgame/sessions takes optional game_id and status, so a game
reloaded mid-play finds the session it was running (status=STARTED) instead
of starting a new one and charging EnakCoin again. An invalid game_id or
status is refused.

integration-enakgame.md §4.4 now describes recovery after a reload: keep the
session_id in sessionStorage, continue a STARTED session before expires_at,
and call complete again for a COMPLETED one to get the full answer, prize
included. The mobile guide and RFC §11 mention the filters.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/repository/enakgame_repository_test.go

@@ -287,7 +287,7 @@ func TestGameSessionRepository_ReadsAndMoves(t *testing.T) {
 	assert.True(t, got.Flagged)
 	assert.NotNil(t, got.CompletionFailedAt)
 
-	sessions, total, err := f.sessions.ListCustomerSessions(ctx, f.customer, 0, 1)
+	sessions, total, err := f.sessions.ListCustomerSessions(ctx, CustomerSessionFilter{CustomerID: f.customer, Limit: 1})
 	require.NoError(t, err)
 	assert.EqualValues(t, 2, total)
 	assert.Len(t, sessions, 1)

internal/repository/game_session_repository.go

@@ -50,7 +50,7 @@ type GameSessionRepository interface {
 	GetSessionBySpendTransaction(ctx context.Context, spendTransactionID uuid.UUID) (*entities.GameSession, error)
 	// ListCustomerSessions returns a page of a customer's sessions, newest first, and
 	// the total.
-	ListCustomerSessions(ctx context.Context, customerID uuid.UUID, offset, limit int) ([]entities.GameSession, int64, error)
+	ListCustomerSessions(ctx context.Context, filter CustomerSessionFilter) ([]entities.GameSession, int64, error)
 
 	CompleteSession(ctx context.Context, id uuid.UUID, completion GameSessionCompletion) (bool, error)
 	RefundSession(ctx context.Context, id, refundTransactionID uuid.UUID, reason string, endedAt time.Time) (bool, error)
@@ -116,8 +116,26 @@ func (r *gameSessionRepository) GetSessionBySpendTransaction(ctx context.Context
 	return r.first(DBFromContext(ctx, r.db).WithContext(ctx).Where("spend_transaction_id = ?", spendTransactionID))
 }
 
-func (r *gameSessionRepository) ListCustomerSessions(ctx context.Context, customerID uuid.UUID, offset, limit int) ([]entities.GameSession, int64, error) {
-	q := DBFromContext(ctx, r.db).WithContext(ctx).Model(&entities.GameSession{}).Where("customer_id = ?", customerID)
+// CustomerSessionFilter selects a customer's sessions.
+type CustomerSessionFilter struct {
+	CustomerID uuid.UUID
+	// Nil for every game.
+	GameID *uuid.UUID
+	// Empty for every status.
+	Status string
+	Offset int
+	Limit  int
+}
+
+func (r *gameSessionRepository) ListCustomerSessions(ctx context.Context, filter CustomerSessionFilter) ([]entities.GameSession, int64, error) {
+	q := DBFromContext(ctx, r.db).WithContext(ctx).Model(&entities.GameSession{}).Where("customer_id = ?", filter.CustomerID)
+	if filter.GameID != nil {
+		q = q.Where("game_id = ?", *filter.GameID)
+	}
+	if filter.Status != "" {
+		q = q.Where("status = ?", filter.Status)
+	}
+	offset, limit := filter.Offset, filter.Limit
 	var total int64
 	if err := q.Count(&total).Error; err != nil {
 		return nil, 0, fmt.Errorf("failed to count game sessions: %w", err)