Backend Release v0.48.0

This PR prepares a new backend release.

When merged, this will:

1. Create a release tag
2. Build and publish a multi-architecture Docker image to Docker Hub

The Docker image will be available at:

• deploystack/backend:latest
• deploystack/backend:v0.48.0

Supported Architectures

• linux/amd64 (Intel/AMD)
• linux/arm64 (Apple Silicon, AWS Graviton)

Release notes:

• feat(backend): add API endpoint for retrieving team usage statistics (0be749b)
• feat(backend): add API endpoint to list featured MCP categories (79c6a53)
• feat(all): add server_count to MCP category schema and responses, view mcp server catalog (7bac93b)
• feat(backend): enhance server list and search responses with category details (92a86a1)
• feat(backend): implement minimal server response format for list endpoints (bf97cd6)
• fix(backend): replace like with ilike for case-insensitive search (e88c5fb)