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>

tests/test_trade_stats_calendar_lib.py

@@ -1,7 +1,9 @@
 import unittest
 from types import SimpleNamespace
 
-from trade_stats_calendar_lib import build_trade_stats_calendar
+from datetime import datetime
+
+from trade_stats_calendar_lib import build_initial_stats_calendar, build_trade_stats_calendar
 
 
 def _row(**kwargs):
@@ -54,6 +56,19 @@ class TradeStatsCalendarLibTests(unittest.TestCase):
         with self.assertRaises(ValueError):
             build_trade_stats_calendar([], 2026, 13, "all", _matches_all)
 
+    def test_initial_calendar_uses_current_month(self):
+        pnls = [(2.5, None, "2026-06-20", _row())]
+        payload = build_initial_stats_calendar(
+            pnls,
+            datetime(2026, 6, 26, 12, 0),
+            _matches_all,
+            reset_hour=8,
+        )
+        self.assertEqual(payload["year"], 2026)
+        self.assertEqual(payload["month"], 6)
+        self.assertEqual(payload["month_open_count"], 1)
+        self.assertIn("2026-06-20", payload["days"])
+
 
 if __name__ == "__main__":
     unittest.main()