fix: 四所统计日历 embed 切换后初始化与加载失败仍渲染网格

统一 initInstanceStatsCalendar，统计 tab 动态注入时重新挂载日历，API 异常时保留月历骨架。

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

embed_templates/embed_shell.html

@@ -121,8 +121,8 @@
 <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=1"></script>
+<script src="/static/trade_stats_calendar.js?v=2"></script>
 {% include 'embed_boot_scripts.html' %}
-<script src="/static/instance_embed.js?v=4"></script>
+<script src="/static/instance_embed.js?v=5"></script>
 </body>
 </html>