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>

CLAUDE.md

@@ -6,6 +6,7 @@
 - **Privacy-first** -- no tracking, no telemetry
 - **Bitcoin only** -- sats/Lightning/Cashu for payments, never fiat, never altcoins
 - **Quality over speed** -- working code, tested, documented
+- **Made for Bitcoiners** -- challenges, content, humor, and culture should reflect the Bitcoin community. Reference Bitcoin history, memes, Lightning, mining, halvings, cypherpunk values, proof of work, etc. in challenge prompts, bot names, arena themes, and narrations. No shitcoin/altcoin references except as trash talk.
 
 ## Quick Reference