fix: 修复统计日历 bootstrap 导致整站 500

日历数据改为安全 JSON 内嵌，仅统计页构建；构建失败时降级为空，避免拖垮其他页面。

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

trade_stats_calendar_lib.py

@@ -1,6 +1,7 @@
 """按交易日聚合实例 trade_records 盈亏，供统计分析页日历 API 使用。"""
 from __future__ import annotations
 
+import json
 from datetime import datetime, timedelta
 from typing import Any, Callable
 
@@ -90,3 +91,25 @@ def build_initial_stats_calendar(
         row_matches_fn,
         reset_hour=reset_hour,
     )
+
+
+def build_stats_calendar_bootstrap(
+    pnls: list[tuple],
+    now_dt: datetime,
+    row_matches_fn: Callable[[Any, str], bool],
+    *,
+    reset_hour: int = 8,
+    segment_key: str = "all",
+) -> tuple[dict[str, Any] | None, str | None]:
+    """返回 (payload, json_str)；失败时 (None, None)，供模板安全内嵌。"""
+    try:
+        payload = build_initial_stats_calendar(
+            pnls,
+            now_dt,
+            row_matches_fn,
+            reset_hour=reset_hour,
+            segment_key=segment_key,
+        )
+        return payload, json.dumps(payload, ensure_ascii=False, separators=(",", ":"))
+    except Exception:
+        return None, None