FIX: Correct chmod syntax in Dockerfile

- Fix chmod command syntax to properly set permissions for multiple directories
- Use && to chain chmod commands instead of space-separated arguments
- Ensure /app/config, /app/ssl, and /app/data have correct 755 permissions

Fixes syntax error that would cause Docker build failures.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

docker/Dockerfile

@@ -88,7 +88,8 @@ COPY --from=backend-builder /app/dist/backend ./dist/backend
 
 COPY package.json ./
 RUN chown -R node:node /app && \
-    chmod 755 /app/config /app/ssl && \
+    chmod 755 /app/config && \
+    chmod 755 /app/ssl && \
     chmod 755 /app/data
 
 VOLUME ["/app/data"]