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

backend/server.js

@@ -2,7 +2,7 @@ require('dotenv').config();
 const express = require('express');
 const http = require('http');
 const cors = require('cors');
-const { bootstrapGames } = require('./bootstrap');
+const { bootstrapGames, bootstrapTickers } = require('./bootstrap');
 const { WebSocketManager, setWebSocketManager } = require('./utils/websocket-manager');
 const { cleanupAllShards } = require('./utils/ecast-shard-client');
 
@@ -50,6 +50,7 @@ setWebSocketManager(wsManager);
 
 if (require.main === module) {
   bootstrapGames();
+  bootstrapTickers();
   server.listen(PORT, '0.0.0.0', () => {
     console.log(`Server is running on port ${PORT}`);
     console.log(`WebSocket server available at ws://localhost:${PORT}/api/sessions/live`);