fix: feed today-only data to AI daily summary to reduce hallucination

Shrink summary context and prompts to today's trades and positions only, and tighten anti-fabrication rules.

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

manual_trading_hub/static/app.js

@@ -3092,7 +3092,7 @@
       .join("");
     return (
       `<div class="ai-closed-trades-wrap">` +
-      `<h4 class="ai-closed-trades-title">平仓明细（昨日 + 今日）</h4>` +
+      `<h4 class="ai-closed-trades-title">平仓明细（今日）</h4>` +
       `<div class="ai-ac-table-wrap"><table class="ai-ac-table ai-closed-trades-table">${head}<tbody>${body}</tbody></table></div>` +
       `</div>`
     );