Add extension metadata and screenshots for LNbits UI

[BenGWeeks]

Summary

This PR adds comprehensive metadata and screenshots to improve the extension's display in the LNbits extension marketplace.

Fixes #41

Changes

1. Updated description.md

• Improved description from single line to comprehensive explanation
• Changed terminology from "client" to "relay multiplexer" for accuracy
• Added benefits list (Simplified Configuration, Always-On Connectivity, Resource Efficient, Subscription Management)

2. Updated config.json

• Changed short_description to "Nostr relay multiplexer"
• Added images array with two screenshots
• Added description_md URL for full description display

3. Added Screenshots

• static/images/1.jpeg - Main relay management interface
• static/images/2.jpeg - WebSocket configuration screen
• Both images cropped to consistent 1557px height

4. Created extensions.json

• Development manifest file with three versions (0.3.7, 0.4.0, 1.0.1)
• Uses nostrclient-dev ID to avoid conflicts
• Proper LNbits Manifest format with featured and extensions keys
• Points to branch for testing

5. Added CLAUDE.md

• Documentation for Claude Code instances working with this repository
• Covers architecture, development commands, and important patterns

Preview

The extension now displays in LNbits with:

• Full description explaining it's a relay multiplexer
• Two professional screenshots showing the UI
• Clear benefits list for users

Testing

Tested on LNbits 1.2.1 using the development extensions.json manifest:

https://raw.githubusercontent.com/BenGWeeks/nostrclient/add-extension-metadata/extensions.json

🤖 Generated with Claude Code

[BenGWeeks]

We can remove the extensions.json from the merge.

[dni]

please remove Claude.md and extensions.json