feat(enakgame): game sessions, rewards, vouchers, budgets and events

EnakGame phases 1-8 of docs/tasks-enakgame.md (EG-101 to EG-803), built on the
existing EnakPoint/EnakCoin wallet (docs/rfc-enakgame.md).

Foundation (phase 1)
- Migrations 000103-000106: games extended with organization, slug, status,
  entry cost and result rules, old games archived (not deleted); budgets,
  versioned reward configs, sessions and session rewards; the ledger types
  GAME_SPEND_REFUND, GAME_REWARD and REWARD_REDEEM_REFUND; audit_logs.
- AuditLogger writes in the caller's transaction only.
- enakgame.limit.user_daily and global_daily organization settings.

Games and sessions (phases 2-4)
- Admin /marketing/enakgame: games, reward config versions (immutable but for
  status, one ACTIVE per game), budgets with non-overlapping global periods and
  a daily job opening the next month.
- Customer /customer/enakgame: start (Idempotency-Key, entry cost and config
  frozen on the session), complete (result validation, reward engine, max_reward
  cap, daily limits via game_reward_counters, one GAME_REWARD per budget),
  automatic refunds for system errors and deactivated games, and a session job.
- Reward engine: FIXED, SCORE_BASED, OUTCOME_BASED, PROBABILITY (crypto/rand),
  rounded down.

Vouchers and budgets (phases 5-6)
- Migration 000108 and 000107: vouchers, codes, redemptions, cost attribution;
  Economy Guard counters.
- STATIC and CODE_POOL redemption in one transaction with the REDEEM PIN action;
  realized cost traced through the lots to the budget that paid the reward.
- Budget metrics: realized cost, forecast, exposure and status. Migrations
  000109-000110 add the wallet_lots indexes they need, built CONCURRENTLY.

Events (phase 7)
- Migration 000111: game events, each with its own EVENT budget. Event extras
  stack per PRD §16 defaults, with event and per-customer limits.

External vouchers (phase 8)
- VoucherProvider contract, two-step PENDING redemption and a recovery job,
  tested with a fake provider. No provider adapter is registered yet, so
  EXTERNAL vouchers stay out of the catalog.

Not yet decided before release: reward rounding, event stacking, budget
exhaustion policy and thresholds (RFC §19.2). Migrations 000103-000111 have
not been run on any shared database.

Also fixes a leftover PAYMENT filter in a wallet test and a data race in a
test PIN fake.

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

internal/processor/loyalty_settings_processor_test.go

@@ -123,6 +123,7 @@ func TestLoyaltySettings_OrganizationWithoutSettingsGetsEveryDefault(t *testing.
 		Transfer:    models.LoyaltyTransferSettings{Enabled: true, MinAmount: 1},
 		PointExpiry: expiry,
 		CoinExpiry:  expiry,
+		EnakGame:    models.EnakGameLimitSettings{UserDailyLimit: 0, GlobalDailyLimit: 0},
 	}, *s)
 }
 
@@ -261,6 +262,7 @@ func TestLoyaltySettings_UpdateOrganization(t *testing.T) {
 	settings.PointValue = 100
 	settings.CoinExpiry.Enabled = true
 	settings.CoinExpiry.Unit = constants.LoyaltyExpiryUnitDay
+	settings.EnakGame.UserDailyLimit = 50
 
 	changes, _, err := p.UpdateOrganization(ctx, org, admin, *settings)
 	require.NoError(t, err)
@@ -269,11 +271,14 @@ func TestLoyaltySettings_UpdateOrganization(t *testing.T) {
 		keys = append(keys, c.Key)
 		assert.Nil(t, c.OutletID, "organization settings have no outlet")
 	}
-	assert.ElementsMatch(t, []string{constants.LoyaltyPointValueKey, "loyalty.coin.expiry_enabled", "loyalty.coin.expiry_unit"}, keys)
+	assert.ElementsMatch(t, []string{constants.LoyaltyPointValueKey, "loyalty.coin.expiry_enabled", "loyalty.coin.expiry_unit", "enakgame.limit.user_daily"}, keys)
 
 	value, err := p.PointValue(ctx, org)
 	require.NoError(t, err)
 	assert.Equal(t, int64(100), value)
+	saved, err := p.Organization(ctx, org)
+	require.NoError(t, err)
+	assert.Equal(t, models.EnakGameLimitSettings{UserDailyLimit: 50, GlobalDailyLimit: 0}, saved.EnakGame)
 }
 
 func TestLoyaltySettings_UpdateRejectsInvalidValues(t *testing.T) {
@@ -312,6 +317,8 @@ func TestLoyaltySettings_UpdateRejectsInvalidValues(t *testing.T) {
 		"fixed date 13-01":       func(s *models.OrganizationLoyaltySettings) { s.PointExpiry.FixedDates = []string{"13-01"} },
 		"fixed date 02-29":       func(s *models.OrganizationLoyaltySettings) { s.CoinExpiry.FixedDates = []string{"02-29"} },
 		"negative grace":         func(s *models.OrganizationLoyaltySettings) { s.CoinExpiry.GraceMonths = -1 },
+		"negative user daily":    func(s *models.OrganizationLoyaltySettings) { s.EnakGame.UserDailyLimit = -1 },
+		"negative global daily":  func(s *models.OrganizationLoyaltySettings) { s.EnakGame.GlobalDailyLimit = -1 },
 	} {
 		s, err := p.Organization(ctx, org)
 		require.NoError(t, err)