Add ConfigCat MCP server to official servers

[kp-cat]

Description

Adding ConfigCat MCP server to the official servers list.

Server Details

• Server: New official server - ConfigCat
• Changes to: Adding new entry to Official Servers section in README.md

Motivation and Context

ConfigCat MCP server enables AI tools to interact with ConfigCat, a feature flag service for teams. Supports managing ConfigCat feature flags, configs, environments, products and organizations. Helps to integrate ConfigCat SDK, implement feature flags and remove zombie (stale) flags.

How Has This Been Tested?

✅ Tested with Claude Desktop using MCP Inspector
✅ Tested with Cursor and VSCode
✅ All tools validated and working
✅ Published to npm: https://www.npmjs.com/package/@configcat/mcp-server
✅ GitHub release: https://github.com/configcat/mcp-server/releases/tag/v0.1.2

Breaking Changes

None - this is a new server addition to the registry.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context

• Repository: https://github.com/configcat/mcp-server
• npm Package: https://www.npmjs.com/package/@configcat/mcp-server
• License: MIT