feat(player): refresh dark gold betting theme

- add generated dark-gold WebP assets for PC/mobile backgrounds, cards, dialogs, tabs, mailbox, VS and bet buttons
- apply the new assets across player home, match detail, outright cards, modals, wallet/profile/detail screens and bet slip controls
- simplify confirm dialogs and reuse bet button resources for normal/pressed states
- hide mobile announcement center, tighten mobile bet list layout, and remove extra dark page backgrounds/scrollbar styling
- cache and deduplicate outright market loading to speed up repeated tab/detail navigation
- document player image-generation constraints in AGENTS.md

apps/player/src/views/desktop/DesktopOutrightDetailView.vue

@@ -8,11 +8,11 @@ import OutrightOptionCard from '../../components/outright/OutrightOptionCard.vue
 import OutrightBetModal, { type OutrightPick } from '../../components/outright/OutrightBetModal.vue';
 import { useAuthStore } from '../../stores/auth';
 import GoldSpinner from '../../components/GoldSpinner.vue';
-import saishiImg from '../../assets/images/saishi.webp';
-import cardBg from '../../assets/images/card-bg.webp';
+import saishiImg from '../../assets/images/generated/saishi-gold-trophy-v1.webp';
+import outrightDetailBg from '../../assets/images/generated/pc-outright-detail-bg-v1.webp';
 import { useDesktopBetLocate, scrollToBetSelection } from '../../composables/useDesktopBetLocate';
 
-const matchCardBg = `url(${cardBg})`;
+const matchCardBg = `url(${outrightDetailBg})`;
 const ODDS_POLL_MS = 15000;
 
 const route = useRoute();
@@ -246,7 +246,7 @@ onUnmounted(stopPolling);
   position: absolute;
   inset: 0;
   background: v-bind(matchCardBg) center / cover no-repeat;
-  opacity: 0.22;
+  opacity: 0.36;
   pointer-events: none;
 }