Add real-time data dashboard with account, positions, keys, and closes.

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

templates/base.html

@@ -81,6 +81,7 @@
             <button type="button" class="nav-backdrop" id="nav-backdrop" aria-label="关闭菜单" hidden></button>
             <nav class="site-nav" id="site-nav">
                 <a href="{{ url_for('positions') }}" class="{% if request.endpoint in ('positions', 'trade_page', 'recommend_page') %}active{% endif %}">下单监控</a>
+                {% if nav_items.dashboard %}<a href="{{ url_for('dashboard') }}" class="{% if request.endpoint == 'dashboard' %}active{% endif %}">数据看板</a>{% endif %}
                 {% if nav_items.strategy %}<a href="{{ url_for('strategy_page') }}" class="{% if request.endpoint in ('strategy_page', 'strategy_records_page') %}active{% endif %}">策略交易</a>{% endif %}
                 {% if nav_items.plans %}<a href="{{ url_for('plans') }}" class="{% if request.endpoint == 'plans' %}active{% endif %}">开单计划</a>{% endif %}
                 <a href="{{ url_for('keys') }}" class="{% if request.endpoint == 'keys' %}active{% endif %}">关键位监控</a>