refactor: 移除四所统计分析页交易日历

删除日历 UI、bootstrap 与 /api/stats/calendar 注册；保留日/周/月统计表。内照明心档案日历不受影响。

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

embed_templates/embed_shell.html

@@ -8,7 +8,6 @@
     <link rel="stylesheet" href="/static/account_risk_badge.css?v=4">
     <link rel="stylesheet" href="/static/instance_page.css?v=2">
     <link rel="stylesheet" href="/static/instance_theme.css?v=48">
-    <link rel="stylesheet" href="/static/trade_stats_calendar.css?v=4">
     <script src="/static/account_risk_badge.js?v=4"></script>
     <meta name="theme-color" content="#0b0d14">
     <title>{{ exchange_display }} · 加密货币 | 交易监控复盘系统</title>
@@ -121,7 +120,6 @@
 <script src="/static/manual_order_rr_preview.js?v=5"></script>
 <script src="/static/strategy_roll.js?v=5"></script>
 <script src="/static/key_monitor_form.js?v=2"></script>
-<script src="/static/trade_stats_calendar.js?v=4"></script>
 {% include 'embed_boot_scripts.html' %}
 <script src="/static/instance_embed.js?v=5"></script>
 </body>