feat: Support fal MCP Server

Summary

I tried to add the fal.ai MCP server, but was unable to as it assumed it needed OAuth.

See: https://fal.ai/docs/documentation/setting-up/mcp#other-mcp-clients

Edit: See additional info but was Abel to setup using the add json but could be improved DX by allowing the add and for it not to think it needs OAuth when this MCP server does not.

Expected Behavior

A setup and configured MCP server for fal.ai.

Also adding the header option is nice so can set the auth header in the add. Perhaps this is possible with add-json, but that's not very terminal friendly to do.

Actual Behavior

Does not setup MCP server.

Steps to reproduce the issue

first tried:

cmd mcp add --transport http fal-ai \
  https://mcp.fal.ai/mcp \
  --header "Authorization: Bearer <my-api-key>

but that asked for OAuth and did https://auth.fal.ai/authorize?response_type=code&client_id=command-code&redirect_uri=XXXX&code_challenge=4B2giHGR8eGid708raKhuVhFheiSVwjjzuDZa8Sa4Ak&code_challenge_method=S256&scope=openid+profile+email+offline_access which fal did not know how to handle

2. Then tried just

 cmd mcp add --transport http fal-ai https://mcp.fal.ai/mcp

and same.

Command Code Version

0.37.2

Operating System

macOS

Terminal/IDE

ghostty

Shell

zsh

Additional context

I got the MCP serve setup and working using:

cmd mcp add-json fal-ai '{"type":"http","url":"https://mcp.fal.ai/mcp","headers":{"Authorization":"Bearer my-api-token"}}'

从 cmd mcp add 入口开始，将其行为与 cmd mcp add-json 进行比较；使用 issue 中的命令重现 fal.ai HTTP 服务器的设置。完成标准是 add 接受所示的 Authorization 标头，并且不会为此服务器启动 OAuth，同时保留可正常工作的 add-json 配置。