拆分 analysis_service：剩余工具函数全部移至 analysis_utils.py

提取 _mgm_hourly_high/_dedupe_forecast_daily/_format_observation_time_local/_parse_local_hour/_parse_utc_datetime/_metar_is_current_local_day/_is_plausible_city_temp。统一 parse_utc_datetime 副本。analysis_service 2082→1966 行。

tests/test_scan_terminal_modules.py

@@ -17,6 +17,7 @@ def test_normalize_scan_terminal_filters_clamps_and_swaps_bounds():
             "limit": 999,
             "high_liquidity_only": True,
             "min_liquidity": 100,
+            "timezone_offset_seconds": "28800",
         }
     )
 
@@ -24,6 +25,7 @@ def test_normalize_scan_terminal_filters_clamps_and_swaps_bounds():
     assert filters["max_price"] == 1.0
     assert filters["limit"] == 200
     assert filters["min_liquidity"] == 5000.0
+    assert filters["timezone_offset_seconds"] == 28800
 
 
 def test_ranked_scan_terminal_result_sorts_and_summarizes_unique_markets():