feat: add uxpro-cli for easy skill installation (#4)

* feat: add uxpro-cli for easy skill installation

- Add CLI tool (uxpro-cli) with commands: init, versions, update
- Support multiple AI assistants: claude, cursor, windsurf, antigravity, all
- Update README with CLI installation guide and usage examples
- Add CC BY-NC 4.0 license
- Update feature counts to accurate numbers

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* refactor: rename CLI from uxpro to uipro

- Package: uxpro-cli -> uipro-cli
- Command: uxpro -> uipro

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

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Co-authored-by: Claude <noreply@anthropic.com>

LICENSE

@@ -0,0 +1,17 @@
+Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
+
+Copyright (c) 2024 Next Level Builder
+
+You are free to:
+- Share — copy and redistribute the material in any medium or format
+- Adapt — remix, transform, and build upon the material
+
+Under the following terms:
+- Attribution — You must give appropriate credit, provide a link to the license,
+  and indicate if changes were made.
+- NonCommercial — You may not use the material for commercial purposes.
+
+No additional restrictions — You may not apply legal terms or technological
+measures that legally restrict others from doing anything the license permits.
+
+Full license text: https://creativecommons.org/licenses/by-nc/4.0/legalcode