feat: ticker symbol voting for live votes

- Add ticker column to games table with migration
- Bootstrap tickers from tickers.json config on startup
- POST /api/votes/live accepts optional ticker field for direct game
  lookup (bypasses timestamp-interval matching)
- Ticker votes work for any game, not just session games
- Update API docs and add e2e tests for ticker voting
- Version bump to 0.6.5

Made-with: Cursor

frontend/src/config/branding.js

@@ -2,7 +2,7 @@ export const branding = {
   app: {
     name: 'HSO Jackbox Game Picker',
     shortName: 'Jackbox Game Picker',
-    version: '0.6.4 - Fish Tank Edition',
+    version: '0.6.5 - Fish Tank Edition',
     description: 'Spicing up Hyper Spaceout game nights!',
   },
   meta: {