feat(ranked): add hidden statistics dashboard

[Poooel]

Summary

• add a public ranked statistics endpoint with aggregate match, Elo, player, queue, and active-player data
• record event-based queue samples in D1 and expose 30-day player and 24-hour queue histories
• add a lazy-loaded, localized /ranked-stats page with live indicators and charts
• prevent search indexing and avoid creating a player identity when the statistics page is opened

Validation

• pnpm lint
• pnpm test:unit (76 tests)
• pnpm test:worker (63 tests)
• pnpm --filter @knucklebones/front build
• pnpm --filter @knucklebones/worker exec tsc --noEmit
• local migration, public API, and direct frontend route smoke tests

Manual test plan

1. Open /ranked-stats and confirm all indicators and both graphs load.
2. Join and leave ranked matchmaking, then confirm the current queue value changes.
3. Complete a ranked game and confirm match, win/loss, Elo, and active-player values update.

Deployment note

Queue history starts collecting after migration 0008 is deployed.

[cloudflare-workers-and-pages]

Deploying knucklebones with    Cloudflare Pages

Latest commit:	879f21a
Status:	✅  Deploy successful!
Preview URL:	https://2cee8b06.knucklebones-8ep.pages.dev
Branch Preview URL:	https://feat-ranked-stats.knucklebones-8ep.pages.dev

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