feat: arena bot sprites, boxing-style Fight Card page

- Arena page shows small sprite previews next to each bot's name
- Server returns archetype in fights list endpoint
- New /fight-card page with 3D perspective fight poster, neon signs,
  animated boxing gloves, fighter bobbing, VS pulse, undercard list
- Added FIGHT CARD to nav bar

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

server/src/routes/fights.ts

@@ -26,11 +26,12 @@ fightsRouter.get('/', async (c) => {
     if (f.winnerId) botIds.add(f.winnerId)
   }
 
-  const botMap = new Map<string, { name: string; avatarSeed: string; eloRating: number; tier: number }>()
+  const botMap = new Map<string, { name: string; avatarSeed: string; archetype: string; eloRating: number; tier: number }>()
   for (const id of botIds) {
     const bot = await db.select({
       name: schema.bots.name,
       avatarSeed: schema.bots.avatarSeed,
+      archetype: schema.bots.archetype,
       eloRating: schema.bots.eloRating,
       tier: schema.bots.tier,
     }).from(schema.bots).where(eq(schema.bots.id, id)).limit(1)