Add FPE Demo MCP to community servers

[lgutschow]

• Adds FF3 Format Preserving Encryption MCP server
• Demonstrates authentication patterns for secure data protection
• Positioned alphabetically in community servers section

Description

Adding FPE Demo MCP to the community servers list - a demonstration MCP server showcasing FF3 Format Preserving Encryption with authentication patterns for secure data protection in LLM workflows.

Server Details

• Server: FPE Demo MCP (new community server listing)
• Changes to: README.md community servers section

Motivation and Context

This adds visibility for a community-developed MCP server that demonstrates:

• FF3 Format Preserving Encryption for sensitive data (SSNs, phone numbers)
• Multiple authentication modes (authless, debug, test, production)
• Both stdio and HTTP transport support
• Educational resource for developers learning MCP security patterns

How Has This Been Tested?

The FPE Demo MCP server has been tested with:

• Claude Desktop (stdio transport)
• Claude Code MCP integration
• HTTP transport with curl and web-based LLMs
• Authentication flows in debug, test, and production modes

Breaking Changes

No breaking changes - this is just adding a listing to the community servers section.

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

• Entry positioned alphabetically in community servers section
• Server demonstrates enterprise-grade security patterns for MCP implementations
• Includes comprehensive documentation and deployment guides
• Licensed under BUSL-1.1 with clear usage terms