Add MCP Server detection and UI indicators for repositories

[rg4444]

Summary

This PR adds support for detecting and displaying MCP (Model Context Protocol) Server configurations in repositories. When a repository contains a processgit.mcp.yaml file or files matching the *.mcp.yaml pattern, the UI now displays visual indicators and provides quick access to the MCP endpoint.

Changes include:

• Added HasSuffix utility method to StringUtils for template usage
• Repository-level MCP detection in RepoAssignment that checks for processgit.mcp.yaml in the default branch
• File-level MCP detection in file view that identifies individual MCP configuration files
• MCP endpoint URL generation and exposure to templates
• Visual badges and indicators in repository header and file views
• Interactive popups with copy-to-clipboard and connection test functionality
• New stylesheet for MCP-related UI components

Validation

• Does this change affect BPMN render/diff?
• Does this change require regenerating images?
• Any schema/validator updates?

Testing

• Verify MCP badge appears on files named processgit.mcp.yaml or matching *.mcp.yaml
• Verify MCP header indicator appears when processgit.mcp.yaml exists in repository root
• Test "Copy URL" functionality in both file and header popups
• Test "Test Connection" button sends proper MCP initialize request
• Verify endpoint URL is correctly formatted with AppURL and repository path
• Test popup interactions (hover, click) work as expected

https://claude.ai/code/session_01YF5jFAob1cRcJeqr7u67cj