fix: 统计日历服务端内嵌 bootstrap，首屏显示盈亏与笔数

与月统计同源 initial_calendar 写入页面，API 失败时仍渲染；四所日历路由独立注册并传入 get_db_fn。

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

hub_bridge.py

@@ -92,6 +92,7 @@ def register_trade_stats_calendar_route(
     load_pnls_fn,
     row_matches_segment_fn,
     reset_hour: int,
+    get_db_fn=None,
 ):
     """四所统计分析页：按月返回各交易日盈亏/笔数。"""
     from flask import jsonify, request
@@ -110,7 +111,7 @@ def register_trade_stats_calendar_route(
             now = datetime.now()
             year = year or now.year
             month = month or now.month
-        get_db = (app.config.get("HUB_CTX") or {}).get("get_db")
+        get_db = get_db_fn or (app.config.get("HUB_CTX") or {}).get("get_db")
         if not get_db:
             return jsonify({"ok": False, "msg": "未配置数据库"}), 500
         conn = get_db()