Show okx_sim/okx_live and gate live API fields by matching mode.

In sim, hide LIVE/API keys and expose simulated fund settings in env UI.

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

lib/instance/templates/instance_header_stats.html

@@ -2,7 +2,7 @@
 <div class="instance-header-stats{% if options_enabled %} instance-header-stats--options{% endif %}">
     <div class="stat-strip-item stat-strip-item--primary">
         <div class="label">交易所</div>
-        <div class="value">{{ exchange_display }}{% if is_sim_mode|default(false) %} <span class="sim-mode-badge" title="本地模拟资金撮合,不下真实交易所单">模拟</span>{% endif %}</div>
+        <div class="value" id="exchange-mode-label" data-funds-field="exchange-mode-label">{{ exchange_display }}</div>
     </div>
     <div class="stat-strip-item">
         <div class="label">交易日</div>