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/transit_trigger.py

@@ -11,10 +11,13 @@ Transit精确触发搜索 (v6.9.0)
 """
 from datetime import datetime, timedelta
 from typing import Dict, List, Optional, Tuple
+import logging
 import math
 
 from ayanamsa_utils import ayanamsa_display_name, normalize_ayanamsa_name, sidereal_flags
 
+logger = logging.getLogger(__name__)
+
 # 行星每日运动速度（°/天）- 用于步长优化
 PLANET_SPEED = {
     'Sun': 0.9856, 'Moon': 13.176, 'Mars': 0.524, 'Mercury': 1.383,
@@ -88,8 +91,9 @@ def _get_transit_lon_precise(
         lon = _get_planet_lon_swe(planet, _datetime_to_jd(dt), ayanamsa_name=ayanamsa)
         if lon is not None:
             return lon, f'swiss_ephemeris_{ayanamsa}'
-    except Exception:
-        pass
+    except Exception as exc:
+        logger.warning("transit_trigger._get_transit_lon_precise degraded: %s", type(exc).__name__)
+        logger.debug("transit_trigger._get_transit_lon_precise degraded", exc_info=True)
     return _get_transit_lon(planet, base_date, (dt - base_date).total_seconds() / 86400.0), 'mean_speed_fallback'