실서버 도커 파일 수정

docker/deploy/backend.Dockerfile

@@ -34,8 +34,8 @@ COPY --from=build /app/dist ./dist
 # Copy package files
 COPY package*.json ./
 
-# Create logs and uploads directories and set permissions (use existing node user with UID 1000)
-RUN mkdir -p logs uploads && chown -R node:node logs uploads && chmod -R 755 logs uploads
+# Create logs, uploads, and data directories and set permissions (use existing node user with UID 1000)
+RUN mkdir -p logs uploads data/mail-sent && chown -R node:node logs uploads data && chmod -R 755 logs uploads data
 
 EXPOSE 3001
 USER node