Fix Windows path encoding for relative paths in mcp.json

[zephsinx]

Description

Relative filepaths on Windows were causing : to be encoded as %3A

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• npm run test (following the project's testing guidelines)
• Manual testing with the following configuration:

Test Configuration:

• Client: Cursor
• OS: Windows
• Node.js version: v22.15.1

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (README.md, CHANGELOG.md)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
  • N/A
• New and existing unit tests pass locally with my changes
• I have checked to ensure my PR is focused on a single feature/fix
• I have updated the version number in package.json