🚨 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>

pnpm-lock.yaml

@@ -8,9 +8,6 @@ importers:
 
   .:
     dependencies:
-      liquidjs:
-        specifier: ^10.19.0
-        version: 10.21.1
       nodemailer:
         specifier: ^6.9.8
         version: 6.10.1
@@ -117,6 +114,13 @@ importers:
       vitest:
         specifier: ^3.1.2
         version: 3.2.4(@types/debug@4.1.12)(@types/node@22.18.1)(sass@1.77.4)(tsx@4.20.3)
+    optionalDependencies:
+      liquidjs:
+        specifier: ^10.19.0
+        version: 10.21.1
+      mustache:
+        specifier: ^4.2.0
+        version: 4.2.0
 
 packages:
 
@@ -4190,6 +4194,10 @@ packages:
   ms@2.1.3:
     resolution: {integrity: sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==}
 
+  mustache@4.2.0:
+    resolution: {integrity: sha512-71ippSywq5Yb7/tVYyGbkBggbU8H3u5Rz56fH60jGFgr8uHwxs+aSKeqmluIVzM0m0kB7xQjKS6qPfd0b2ZoqQ==}
+    hasBin: true
+
   nanoid@3.3.11:
     resolution: {integrity: sha512-N8SpfPUnUp1bK+PMYW8qSWdl9U+wwNWI4QKxOYDy9JAro3WMX7p2OeVRF9v+347pnakNevPmiHhNmZ2HbFA76w==}
     engines: {node: ^10 || ^12 || ^13.7 || ^14 || >=15.0.1}
@@ -8533,7 +8541,8 @@ snapshots:
 
   colorette@2.0.20: {}
 
-  commander@10.0.1: {}
+  commander@10.0.1:
+    optional: true
 
   commander@2.20.3: {}
 
@@ -10033,6 +10042,7 @@ snapshots:
   liquidjs@10.21.1:
     dependencies:
       commander: 10.0.1
+    optional: true
 
   locate-path@5.0.0:
     dependencies:
@@ -10421,6 +10431,9 @@ snapshots:
 
   ms@2.1.3: {}
 
+  mustache@4.2.0:
+    optional: true
+
   nanoid@3.3.11: {}
 
   napi-postinstall@0.3.3: {}