Misc MCP improvements

[paulgb]

• Adds a note pointing to the docs for other MCP clients
• Adds a note about installing for local development
• Reads server base URL from global forevervm CLI config if that's where the token comes from
• Adds endpoints for resources and prompts, even though we don't have any, which makes the logs cleaner (otherwise there is an error when the client hits them)
• When a request fails, we send an error message to the client instead of exiting
• Moves MCP installation-related code to a separate file

[ellipsis-dev]

Debug logging alert: Consider removing or replacing the console.error debug statement printing options with a proper logger.