refactor: improve logging in weather arts worker

- Added logging for skipped recent cities.
- Enhanced logging for selected cities after filtering.

This refactor improves the observability of the city selection
process in the BatchGenerateWeatherArtsWorker. The added logs
provide better insight during debugging and monitoring, allowing
developers to track recent selections and identify any issues
related to city filtering more effectively.

app/workers/batch_generate_weather_arts_worker.rb

@@ -69,14 +69,15 @@ class BatchGenerateWeatherArtsWorker
   end
 
   def select_cities(recent_city, countries, limit)
-    cutoff_time = Time.current - GENERATION_INTERVAL
     Rails.logger.debug "Select Cities with limit: #{limit}, in #{countries.size} countries."
+    Rails.logger.debug "Skip Cities(count: #{recent_city.count}) list: #{recent_city.map(&:name).join(', ')}."
     # 第一阶段：筛选 active 城市, 排除最近生成过的城市
     active_cities = City.where.not(id: recent_city.pluck(:id))
                         .where(active: true, country_id: countries.map(&:id)).limit(limit).to_a
     selected = active_cities.first(limit)
     remaining = limit - selected.size
     Rails.logger.debug "Step1: Selected #{selected.size} cities with active city."
+    Rails.logger.debug "==recent selected city list: #{selected.map(&:name).join(', ')}."
 
     return selected if remaining <= 0
 
@@ -101,6 +102,7 @@ class BatchGenerateWeatherArtsWorker
         Rails.logger.debug "== No valid cities found in country: [#{country.name}]"
       end
     end
+    Rails.logger.debug "==recent selected city list: #{selected.map(&:name).join(', ')}."
     Rails.logger.debug "Finished selected #{selected.size} cities."
     selected
   end