feat: add Docker support with private registry

- Add Dockerfile with vim, Korean locale, visual mode disabled
- Add docker-compose.yml with build/push support for reg.firstgarden.co.kr
- Add docker-entrypoint.sh for multi-service support
- Add .dockerignore
- Update README.md with Docker deployment guide
- Consolidate SERVICE_KEY into DATA_API_SERVICE_KEY

core/config.py

@@ -160,9 +160,9 @@ class Config:
         
         self.force_update = self._get_bool('FORCE_UPDATE', False)
         
-        # Weather 서비스 설정
+        # Weather 서비스 설정 (DATA_API_SERVICE_KEY 사용)
         self.weather_service = {
-            'service_key': self._get_env('SERVICE_KEY', ''),
+            'service_key': self._get_env('DATA_API_SERVICE_KEY', ''),
         }
         
         # FTP 설정