OAuth Token Refresh Support

What: Proactive and on-demand refresh of OAuth tokens for MCP servers How to use:

# Tokens are automatically refreshed when they expire soon
# Manual refresh available through MCP server reconnection

Details:

• Proactive refresh when tokens expire within 5 minutes (300 seconds)
• Automatic retry mechanism with proper error handling
• Maintains existing tokens if refresh fails
• Supports both refresh_token and authorization_code flows
• Evidence: refreshAuthorization() at line 391499, proactive refresh logic at line 391410