🚨 CRITICAL FIX: Replace require() with dynamic imports for webpack compatibility

- Replace require('liquidjs') and require('mustache') with dynamic imports
- Fix webpack compatibility issues and ES module support
- Make template engine initialization lazy and async
- Add proper error handling for optional dependencies
- Use Function('return import(...)') pattern to avoid TypeScript issues
- Maintain backward compatibility with existing configurations

This resolves critical webpack bundling issues in client applications.

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

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/payload-mailing",
-  "version": "0.0.9",
+  "version": "0.0.10",
   "description": "Template-based email system with scheduling and job processing for PayloadCMS",
   "type": "module",
   "main": "dist/index.js",