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砍掉机场快照，改为 per-city 独立告警；新增安卡拉 MGM 17128 高频监控

快照定时推送无实际价值（没变化也报），改为仅温度急变时触发告警。
各城市独立检测、独立冷却，不再捆绑推送。
同时接入安卡拉 Esenboğa 机场 MGM 站点 17128 的实时温度数据。

Constraint: 快照已运行验证格式无误，砍掉不影响现有急变告警功能
Scope-risk: 中低，仅影响高频通道逻辑，主循环不变
Tested: ruff check 通过
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src/data_collection/weather_sources.py

@@ -805,6 +805,19 @@ class WeatherDataCollector(OpenMeteoCacheMixin, SettlementSourceMixin, MetarSour
         if not mgm_data:
             return
         results["mgm"] = mgm_data
+        # Log airport obs for high-freq monitoring (Ankara 17128)
+        try:
+            mgm_current = mgm_data.get("current") or {}
+            DBManager().append_airport_obs(
+                icao=str(istno),
+                city=city_lower,
+                temp_c=mgm_current.get("temp"),
+                wind_kt=mgm_current.get("wind_speed_kt"),
+                pressure_hpa=mgm_current.get("pressure"),
+                obs_time=mgm_data.get("obs_time") or datetime.now().isoformat(),
+            )
+        except Exception:
+            logger.exception("airport_obs_log append failed for mgm city={}", city_lower)
         if include_nearby:
             results["nearby_source"] = "mgm"
             nearby = self.fetch_mgm_nearby_stations(province, root_ist_no=istno)