Add live expiry countdown for options positions on instance page and trading hub.

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

manual_trading_hub/hub.py

@@ -771,6 +771,7 @@ _TRADE_STATS_CALENDAR_CSS = _REPO_STATIC / "trade_stats_calendar.css"
 _TRADE_STATS_CALENDAR_JS = _REPO_STATIC / "trade_stats_calendar.js"
 _ACCOUNT_RISK_BADGE_CSS = _REPO_STATIC / "account_risk_badge.css"
 _ACCOUNT_RISK_BADGE_JS = _REPO_STATIC / "account_risk_badge.js"
+_OPTIONS_EXPIRY_COUNTDOWN_JS = _REPO_STATIC / "options_expiry_countdown.js"
 
 
 @app.get("/assets/account_risk_badge.css")
@@ -795,6 +796,16 @@ def hub_account_risk_badge_js():
     )
 
 
+@app.get("/assets/options_expiry_countdown.js")
+def hub_options_expiry_countdown_js():
+    if not _OPTIONS_EXPIRY_COUNTDOWN_JS.is_file():
+        raise HTTPException(status_code=404, detail="options_expiry_countdown.js not found")
+    return FileResponse(
+        str(_OPTIONS_EXPIRY_COUNTDOWN_JS),
+        media_type="application/javascript; charset=utf-8",
+    )
+
+
 @app.get("/assets/ai_review_render.js")
 def hub_ai_review_render_js():
     """与三所实例共用仓库根 static/ai_review_render.js（须在 /assets mount 之前注册）。"""