feat(hub): enrich AI coach with fund history, closed trades, and chat uploads

- Add 15-day fund snapshot store and /api/hub/account on all instances

- Summary includes yesterday/today trades, fund columns, and section 5 操作建议

- Chat context distinguishes empty positions from local monitors

- Support image/document attachments in AI chat

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -18,6 +18,7 @@
 manual_trading_hub/hub_settings.json
 manual_trading_hub/hub_ai_summaries.json
 manual_trading_hub/hub_ai_chat.json
+manual_trading_hub/hub_ai_fund_history.json
 manual_trading_hub/data/
 
 # 数据库与上传（运行时生成）