feat: v3 — fight loop, expanded challenges, FightPage ownership guard

- Add fight-loop CLI for automated mock fights with elo-based matchmaking
- Expand challenge types, scoring narrations, arenas, and mock bot pool
- FightPage "Fight again" buttons now only show for your own bot
- FightViewer async scene init, live fight polling with round counter
- Extract mock answers into separate answers module

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

server/src/fight-loop-cli.ts

@@ -0,0 +1,23 @@
+import './db/index.js'
+import { startFightLoop } from './engine/fight-loop.js'
+
+const args = process.argv.slice(2)
+const maxFights = parseInt(args.find(a => a.startsWith('--max='))?.split('=')[1] || '0') || Infinity
+const intervalMs = parseInt(args.find(a => a.startsWith('--interval='))?.split('=')[1] || '0') || 8000
+const style = (args.find(a => a.startsWith('--style='))?.split('=')[1] || 'mixed') as 'random' | 'elo_close' | 'mixed'
+
+console.log('[botfights] fight loop CLI')
+console.log(`  max fights: ${maxFights === Infinity ? 'unlimited' : maxFights}`)
+console.log(`  interval: ${intervalMs}ms`)
+console.log(`  style: ${style}`)
+console.log('')
+
+startFightLoop({ maxFights, intervalMs, matchmakingStyle: style })
+  .then(() => {
+    console.log('[botfights] fight loop finished')
+    process.exit(0)
+  })
+  .catch((err) => {
+    console.error('[botfights] fight loop error:', err)
+    process.exit(1)
+  })