Create `styleframe-starter-svelte` repository

[alexgrozav]

Create a ready-to-clone starter repository: styleframe-starter-svelte.

• Stack: Svelte + TypeScript + Styleframe
• Configure with:
  • Pre-configured build tools
  • Example component styles
  • Theme setup
  • Development workflow

This starter will provide a quick entry point for users to begin using Styleframe in Svelte projects.