feat(enakgame): spin as an EnakGame game; remove the old game flow

EnakGame phase 10 of docs/tasks-enakgame.md (EG-1001 to EG-1003).

Spin (EG-1001)
- PROBABILITY entries take an optional label (a wheel segment). The customer game
  list shows a PROBABILITY game's prizes (entry, label, amount, never weights), and
  completing returns the drawn prize, so the client can draw the wheel and stop it
  on the server's draw.
- docs/enakgame-spin.md: the admin steps to set up spin per organization (no
  seeder) and the customer app flow. An HTTP test plays it end to end.

Old game flow removed (EG-1002)
- Routes POST /customer/spin, GET /customer/games, GET /customer/ferris-wheel, and
  admin /marketing/games, /marketing/game-prizes, /marketing/rewards, with their
  handlers, services, processors, repositories, validators, models, contracts,
  mappers and tests (GamePlayProcessor, SpinGameService, rewards, ...). This also
  closes RFC §15 findings 1 and 2 (double charge, spinning another org's game).
- Tables games, game_prizes, game_plays and rewards stay for ledger history.
  entities.StringSlice moves to its own file; the omset tracker (unrouted) keeps
  game_id but no longer embeds the old game response.

games.is_active dropped (EG-1003)
- Migration 000115; nothing reads metadata.coin_cost any more.

The EnakPoint integration docs now point at /customer/enakgame. The Postgres tests
were not run: no test database here. Migration 000115 has not been run anywhere.
The customer app must stop calling the removed endpoints before this is deployed.

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

internal/processor/game_session_processor.go

@@ -2,6 +2,7 @@ package processor
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"strings"
@@ -384,11 +385,26 @@ func (p *GameSessionProcessor) ListGames(ctx context.Context, customerID uuid.UU
 	if err != nil {
 		return nil, err
 	}
+	configs, err := p.games.ListActiveRewardConfigs(ctx, customer.OrganizationID)
+	if err != nil {
+		return nil, err
+	}
+	prizes := make(map[uuid.UUID][]models.GamePrize, len(configs))
+	for _, c := range configs {
+		if c.RewardType != constants.GameRewardTypeProbability {
+			continue
+		}
+		// Rules passed Validate when the configuration was made.
+		if list, err := probabilityPrizes(json.RawMessage(c.Rules)); err == nil {
+			prizes[c.GameID] = list
+		}
+	}
 	out := make([]models.CustomerEnakGame, 0, len(games))
 	for _, g := range games {
 		item := models.CustomerEnakGame{
 			ID: g.ID, Name: g.Name, Description: g.Description, ThumbnailURL: g.ThumbnailURL, GameURL: g.GameURL,
 			Version: g.Version, EntryCost: g.EntryCost, SessionTTLSeconds: g.SessionTTLSeconds, Events: []models.CustomerGameEvent{},
+			Prizes: prizes[g.ID],
 		}
 		for _, e := range events[g.ID] {
 			item.Events = append(item.Events, models.CustomerGameEvent{