feat: WordPress migration support — upload existing site files

- Add two deployment modes for WordPress: Fresh Install vs Migrate Existing Site
- Fresh Install: vanilla WordPress from official image (existing behavior)
- Migrate: upload ZIP with wp-content/ (themes, plugins, uploads), wp-config.php, .htaccess
- Custom entrypoint merges staged wp-content into PVC on first container run
- Add init container for fresh WordPress builds (empty source context for Kaniko)
- Increase upload limit to 200MB for WordPress sites
- Add PHP upload limits (64MB) and memory config in WordPress Dockerfile
- Update deploy page review step to show WordPress mode info
- All UI in English

backend/src/applications/applications.controller.ts

@@ -51,7 +51,7 @@ export class ApplicationsController {
   @ApiOperation({ summary: 'Upload application code (zip file)' })
   @ApiConsumes('multipart/form-data')
   @UseInterceptors(FileInterceptor('file', {
-    limits: { fileSize: 100 * 1024 * 1024 }, // 100MB
+    limits: { fileSize: 200 * 1024 * 1024 }, // 200MB (WordPress sites can be large)
   }))
   async uploadCode(
     @Param('id') id: string,