修复非 AMOS 城市温度显示为整数：改用机场站点温度替代 METAR

city_weather.current.temp 来自 METAR（整数），改为从 mgm_nearby[0].temp
取机场高频数据源的站点温度（小数精度）。JMA/FMI/KNMI/MGM 源均保留一位小数。

Constraint: 首尔/釜山走 runway_temps 已有精度，不受影响
Tested: pytest 176 passed, ruff check 通过

src/utils/telegram_push.py

@@ -737,16 +737,17 @@ def _build_airport_status_message(
     runway_data = (amos.get("runway_obs") or {}) if amos else {}
     runway_pairs = runway_data.get("runway_pairs") or []
     runway_temps = runway_data.get("temperatures") or []
-    current = city_weather.get("current") or {}
+    # Non-AMOS cities: get temp from airport station (stored in mgm_nearby), not METAR
-    temp = current.get("temp")
+    mgm_nearby = city_weather.get("mgm_nearby") or []
+    station_temp = mgm_nearby[0].get("temp") if mgm_nearby else None
 
     lines = [label, ""]
     if runway_pairs and runway_temps and len(runway_pairs) == len(runway_temps):
         for (r1, r2), (t, _d) in zip(runway_pairs, runway_temps):
             lines.append(f"{r1}/{r2} {t:.1f}°C")
-    elif temp is not None:
+    elif station_temp is not None:
         time_suffix = f" ({local_time})" if local_time else ""
-        lines.append(f"{temp:.1f}°C{time_suffix}")
+        lines.append(f"{station_temp:.1f}°C{time_suffix}")
     if deb_pred is not None:
         lines.append(f"DEB 最高 {deb_pred:.1f}°C")
     return "\n".join(lines)