feat: add Cursor plugin support

[alvaroarmijos]

Description

Adds Cursor IDE support to the VGV AI Flutter Plugin. This includes:

• .cursor-plugin/plugin.json — Cursor plugin manifest that maps skills, hooks, and MCP server configuration so Cursor can discover and load the plugin
• README.md — adds a dedicated Cursor installation section with the /add-plugin vgv-ai-flutter-plugin chat command and a link to the Cursor Marketplace
• CLAUDE.md — updates the project overview and repository structure to reflect that this plugin supports both Claude Code and Cursor

Closes #48

Type of Change

• New feature (feat)
• Bug fix (fix)
• Code refactor (refactor)
• Documentation (docs)
• CI change (ci)
• Chore (chore)

[ryzizub]

We have couple of important stuff like hooks that are not addressed here and those might not be supported by cursor. But good start @alvaroarmijos ! ❤️

[alvaroarmijos]

@ryzizub Correct! This initial PR focuses on enabling skills and MCP server support for Cursor as a first step. Hooks compatibility will be addressed in a follow-up PR. Cursor uses a different hook event format and payload structure than Claude Code, so those scripts will need adaptation before we can wire them up.

[ryzizub]

Moving this to draft as there are some extra steps we are discussing internally

[RuiMiguel]

@ryzizub Correct! This initial PR focuses on enabling skills and MCP server support for Cursor as a first step. Hooks compatibility will be addressed in a follow-up PR. Cursor uses a different hook event format and payload structure than Claude Code, so those scripts will need adaptation before we can wire them up.

I'm curious to see the difference between hooks. I wouldn't like to do them twice and maintain nearly similar scripts, but if they use different payload we would need to adapt it

[RuiMiguel]

Also linked to this other issue #66 we must document Cursor hooks at its own md document. That's a good example of what Claude and Cursor should include into their owns md files