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/handler/loyalty_settings_org_db_test.go

@@ -105,6 +105,7 @@ func TestOrganizationLoyaltySettingsEndpoints_AgainstPostgres(t *testing.T) {
 	assert.Equal(t, map[string]any{"coin_amount": float64(1), "point_amount": float64(1)}, got["exchange"])
 	assert.Equal(t, true, got["transfer"].(map[string]any)["enabled"])
 	assert.Equal(t, "MONTH", got["point_expiry"].(map[string]any)["unit"])
+	assert.Equal(t, map[string]any{"user_daily_limit": float64(0), "global_daily_limit": float64(0)}, got["enakgame"], "0 is no limit")
 	impact := got["impact"].(map[string]any)
 	assert.EqualValues(t, 50000, impact["outstanding_points"])
 	assert.EqualValues(t, impact["point_rupiah_before"], impact["point_rupiah_after"])
@@ -177,4 +178,17 @@ func TestOrganizationLoyaltySettingsEndpoints_AgainstPostgres(t *testing.T) {
 	status, body = call(http.MethodGet, "/manager/loyalty-settings", "")
 	require.Equal(t, http.StatusOK, status, body)
 	assert.EqualValues(t, 100, data(body)["point_value"])
+
+	// The EnakGame limits (docs/rfc-enakgame.md §5.10) go through the same endpoint and
+	// history.
+	status, body = call(http.MethodPut, "/manager/loyalty-settings", `{"enakgame": {"user_daily_limit": 50, "global_daily_limit": 10000}}`)
+	require.Equal(t, http.StatusOK, status, body)
+	assert.Equal(t, map[string]any{"user_daily_limit": float64(50), "global_daily_limit": float64(10000)}, data(body)["enakgame"])
+	var limits []struct{ Key, NewValue string }
+	require.NoError(t, db.Raw(`SELECT key, new_value FROM loyalty_setting_changes WHERE organization_id = ? AND key LIKE 'enakgame.%' ORDER BY key`, org).Scan(&limits).Error)
+	assert.Equal(t, []struct{ Key, NewValue string }{{"enakgame.limit.global_daily", "10000"}, {"enakgame.limit.user_daily", "50"}}, limits)
+	status, _ = call(http.MethodPut, "/manager/loyalty-settings", `{"enakgame": {"user_daily_limit": -1}}`)
+	assert.Equal(t, http.StatusBadRequest, status)
+	status, _ = call(http.MethodPut, "/purchasing/loyalty-settings", `{"enakgame": {"user_daily_limit": 1}}`)
+	assert.Equal(t, http.StatusForbidden, status)
 }