refactor: change weather art job processing method

- Replace synchronous job processing with asynchronous
- Ensure processing does not exceed API rate limits

This change allows for better performance by offloading the
queue management to Sidekiq, enabling more efficient
parallel processing of weather art generation. It also
prevents potential API rate limit violations by maintaining
a delay between requests.

app/workers/batch_generate_weather_arts_worker.rb

@@ -10,7 +10,8 @@ class BatchGenerateWeatherArtsWorker
     cities_to_process.each do |city|
       break if Time.current - start_time > max_duration
 
-      GenerateWeatherArtJob.perform_now(city)
+      # GenerateWeatherArtJob.perform_now(city)
+      GenerateWeatherArtJob.perform_async(city)
       sleep 1.minute # 确保不超过API限制
     end
   end