Remove contract profile from navigation and retire its routes.

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

templates/base.html

@@ -532,7 +532,6 @@
                 <a href="{{ url_for('records') }}" class="{% if request.endpoint in ('records', 'trades') %}active{% endif %}">交易记录与复盘</a>
                 <a href="{{ url_for('stats') }}" class="{% if request.endpoint == 'stats' %}active{% endif %}">统计分析</a>
                 {% if nav_items.fees %}<a href="{{ url_for('fees') }}" class="{% if request.endpoint == 'fees' %}active{% endif %}">手续费配置</a>{% endif %}
-                {% if nav_items.contract %}<a href="{{ url_for('contract_profile_page') }}" class="{% if request.endpoint == 'contract_profile_page' %}active{% endif %}">品种简介</a>{% endif %}
                 <a href="{{ url_for('settings') }}" class="{% if request.endpoint == 'settings' %}active{% endif %}">系统设置</a>
             </nav>
         </header>