chore: migrate from @alyne.com to @alyne scope (GitHub Packages)

[bhushaan]

Summary

• Update package name from @alyne.com/handlebars-helpers to @alyne/handlebars-helpers
• Update .npmrc to use GitHub Packages registry (NPM_TOKEN_GPH)

Test plan

• Verify npm install works with NPM_TOKEN_GPH set
• Verify no @alyne.com/ references remain

🤖 Generated with Claude Code

[manuel-reil]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[ayushsri9179]

Acceptance Criteria

• yarn install / npm install succeeds with NPM_TOKEN_GPH set in the environment
• No remaining references to @alyne.com/ exist anywhere in the repository (source, config, lock files)