mail-templates도 수정

docker/deploy/backend.Dockerfile

@@ -35,7 +35,11 @@ COPY --from=build /app/dist ./dist
 COPY package*.json ./
 
 # Create logs, uploads, and data directories and set permissions (use existing node user with UID 1000)
-RUN mkdir -p logs uploads/mail-attachments data/mail-sent && \
+RUN mkdir -p logs \
+    uploads/mail-attachments \
+    uploads/mail-templates \
+    uploads/mail-accounts \
+    data/mail-sent && \
     chown -R node:node logs uploads data && \
     chmod -R 755 logs uploads data