컨테이너 이름을 report-* 형식으로 통일

mysql_db → report-db, report_backend → report-backend, report_frontend → report-frontend

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docker-compose.yml

@@ -1,7 +1,7 @@
 services:
   mysql:
     image: mysql:8.0
-    container_name: mysql_db
+    container_name: report-db
     restart: always
     environment:
       MYSQL_DATABASE: ${DB_NAME:-report_db}
@@ -21,7 +21,7 @@ services:
 
   backend:
     build: ./backend
-    container_name: report_backend
+    container_name: report-backend
     restart: always
     ports:
       - "${BACKEND_PORT:-54530}:3000"
@@ -45,7 +45,7 @@ services:
 
   frontend:
     build: ./frontend
-    container_name: report_frontend
+    container_name: report-frontend
     restart: always
     ports:
       - "${FRONTEND_PORT:-55110}:80"