feat: create @soroban/templates package with dual Node.js/Python interface

- Add dedicated templates package in packages/templates/
- Provide clean exports for both Node.js/TypeScript and Python
- Include flashcards.typ and single-card.typ templates
- Add webpack-safe dynamic path resolution
- Configure PNPM workspace integration
- Support both direct paths and getTemplatePath() function

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

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

pnpm-workspace.yaml

@@ -1,5 +1,6 @@
 packages:
   - 'apps/*'
+  - 'packages/templates'
   - 'packages/core/client/node'
   - 'packages/core/client/typescript'
   - 'packages/core/client/browser'