Use 100k equity for recommend list when CTP is offline.

When SimNow or live CTP is disconnected, the tradable-products section shows four whitelisted symbols and calculates max lots from a fixed 100,000 capital instead of reference capital in settings.

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

templates/trade.html

@@ -132,7 +132,7 @@
     <div class="card trade-card trade-card-full" id="recommend">
             <h2>可开仓品种</h2>
             <div class="card-body">
-                <p class="hint">最大手数 = floor(权益 × 保证金上限 <strong>{{ max_margin_pct }}%</strong> ÷ 1手保证金)；当前权益 <strong class="text-accent" id="rec-capital">{{ '%.2f'|format(capital) }}</strong> 元。
+                <p class="hint">最大手数 = floor(权益 × 保证金上限 <strong>{{ max_margin_pct }}%</strong> ÷ 1手保证金)；当前权益 <strong class="text-accent" id="rec-capital">{{ '%.2f'|format(recommend_capital) }}</strong> 元。
                     {% if sizing_mode == 'fixed' %}仅显示最大手数 ≥ <strong>{{ fixed_lots }}</strong> 手的品种。{% endif %}
                     {% if small_account_scope %}<span class="text-muted">{{ small_account_scope_hint }}。</span>{% endif %}
                     {% if night_session %}<span class="text-muted">当前为夜盘时段，品种下拉与下表仅显示有夜盘品种；带「夜盘」标记。</span>{% elif not small_account_scope %}<span class="text-muted">有夜盘交易的品种带「夜盘」标记。</span>{% endif %}