让免费层限流的报告跟真实限流一致，并给少一块结果的静默失败留下函数名和错误类型。

Co-Authored-By: Grok (agent loop)

scripts/cmd_muhurta.py

@@ -14,6 +14,9 @@ from typing import Dict, Optional, List
 from datetime import datetime, timedelta
 import sys
 import os
+import logging
+
+logger = logging.getLogger(__name__)
 
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
 
@@ -40,8 +43,9 @@ def _get_sun_moon_lons(year: int, month: int, day: int,
         sun_res = swe.calc_ut(jd_ut, swe.SUN, flags)
         moon_res = swe.calc_ut(jd_ut, swe.MOON, flags)
         return _primary_longitude(sun_res[0]), _primary_longitude(moon_res[0]), True
-    except Exception:
-        pass
+    except Exception as exc:
+        logger.warning("cmd_muhurta._get_sun_moon_lons degraded: %s", type(exc).__name__)
+        logger.debug("cmd_muhurta._get_sun_moon_lons degraded", exc_info=True)
     # 近似算法
     from muhurta import _approx_sun_moon_lon
     sun_lon, moon_lon = _approx_sun_moon_lon(year, month, day)