Problem

MCPB download links on the documentation site use gitlab-mcp-latest.mcpb which:

1. Gets intercepted by Vue Router (opens as HTML page instead of downloading)
2. Doesn't indicate which version the user is downloading

Solution

1. Add __VERSION__ placeholder to template files (.md.in)
2. inject-tool-refs.ts replaces placeholder with actual version from:
   • RELEASE_VERSION env var (set by CI from latest GitHub release tag)
   • Fallback: package.json version
3. Add download attribute to prevent Vue Router interception
4. Links now use versioned filenames: gitlab-mcp-6.43.0.mcpb

Changes

• src/cli/inject-tool-refs.ts - Add __VERSION__ placeholder support
• .github/workflows/docs.yml - Pass RELEASE_VERSION env to inject-tool-refs
• docs/index.md.in - Use __VERSION__ in download link
• docs/guide/installation/claude-desktop.md.in - Use __VERSION__ in download links
• docs/clients/claude-desktop.md → docs/clients/claude-desktop.md.in - Convert to template
• docs/.vitepress/config.mts - Update ignoreDeadLinks pattern for versioned files

Closes #199