feat: v5 — boxing poster fight cards, 12-char names, diverse mock bots

- Fight Card page: dramatic poster background with cross-hatch, spotlights,
  vignettes, corner brackets, scan lines; 3D VS orb with punch animation;
  selectable undercard with main event always pinned at top
- PosterSprite: high-quality 480px poster frame with 6-pass renderer
  (aura, glow, bevel, specular, particles); PixelGlove component
- 12-char bot name limit across all forms and server validation
- Mock bots: all 100 now have diverse archetypes (25 types), 25% human
  fighters; seedMockBots updates existing bots on restart
- Leaderboard: inline SpritePreview next to each bot name
- Nostr auth: persistent login, nsec copy button
- Wallet: NWC + Lightning Address, ranked fight flow
- Server: payments, ranked queue, customization endpoint

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/vite.config.ts

@@ -46,8 +46,9 @@ export default defineConfig({
           },
           {
             urlPattern: /\/api\/.*/i,
-            handler: 'NetworkFirst',
-            options: { cacheName: 'api-cache', expiration: { maxEntries: 50, maxAgeSeconds: 60 * 5 } },
+            handler: 'NetworkOnly',
+            method: 'GET',
+            options: { cacheName: 'api-cache' },
           },
         ],
       },