2026.04.17 - WebSocket Meme Stats Data Enrichment

Websocket MEME_STATS payload updated with richer market/holder/tag engine analytics

• Expanded meme_stats payload with multi-timeframe trading stats
  • buy*, sell*, volume*, volume*_change_percent...
• Added holder distribution metrics
  • holder, top10_holder_percentage
• Added tag/risk indicators
  • sniper_count, bundler_count, insider_count, dev_count
  • sniper_held_percentage, bundler_held_percentage, insider_held_percentage, dev_held_percentage