Add MCPRelay - Secure web access and crawling service for AI agents

[chetan1arora]

Description

This PR adds MCPRelay to the MCP servers directory - a production-ready MCP server that provides secure web access and crawling for AI agents through smart-proxy selection.

Server Details

• Server: MCPRelay (new third-party server addition)
• Changes to: README.md (adding new server entry to the official integrations list)

Motivation and Context

MCPRelay fills a critical need in the MCP ecosystem by providing:

• Secure web access for AI agents that need to fetch content from websites
• Smart proxy selection to handle sites with bot detection or geographic restrictions
• Support for multiple proxy types (datacenter, residential, mobile)
• Professional service with transparent pricing and usage analytics

This enables AI agents to reliably access web content that would otherwise be blocked or restricted.

How Has This Been Tested?

• Live service deployed at api.mcprelay.dev
• Tested with Claude Desktop using the MCP client
• Successfully fetches content from various websites including those with bot protection
• NPM package published and actively used by the community
• Dashboard and analytics working at mcprelay.dev

Breaking Changes

None - this is a new server addition that doesn't affect existing functionality.

Types of changes

• New feature (non-breaking change which adds functionality)
• 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

• Installation: npm install -g @mcprelay/client
• Website: https://mcprelay.dev
• NPM Package: https://www.npmjs.com/package/@mcprelay/client
• Service Status: Live and production-ready
• Community: Actively used by developers for web scraping and content access

MCPRelay follows MCP best practices with proper tool schemas, error handling, and secure authentication via API keys.