ci: Improve Docker build workflow and update dependencies

- Add release type detection to distinguish between version tags and edge builds
- Implement separate Docker build steps for release and edge builds with appropriate tags
- Add edge and SHA-based image tags for main branch builds
- Update nginx configuration to support Vietnamese (vi) language routing
- Simplify nginx location block to handle static files and fallback to index.html
- Remove javascript-obfuscator and ts-migrate from dependencies
- Update README with simplified self-hosting instructions using npx http-server
- Consolidate multiple server setup examples into single recommended approach
- Update build preview command to use npm run preview instead of npx serve
- Improve localization files for German, English, Vietnamese, and Chinese
- Update worker files and TypeScript logic files for improved functionality
- Enhance PDF tool pages with better structure and internationalization support

src/pages/pdf-multi-tool.html

@@ -198,7 +198,7 @@
         class="hidden border-2 border-dashed border-gray-600 rounded-lg p-6 sm:p-12 text-center max-w-full cursor-pointer"
         onclick="document.getElementById('pdf-file-input').click()">
         <i data-lucide="upload-cloud" class="w-12 h-12 sm:w-16 sm:h-16 mx-auto text-gray-400 mb-3 sm:mb-4"></i>
-        <p class="text-gray-300 text-base sm:text-lg mb-1 sm:mb-2" data-i18n="multiTool.uploadPdfFiles">Upload PDF Files
+        <p class="text-gray-300 text-base sm:text-lg mb-1 sm:mb-2" data-i18n="multiTool.uploadPdfFiles">Select PDF Files
         </p>
         <p class="text-gray-400 text-xs sm:text-sm mb-3 sm:mb-4" data-i18n="multiTool.dragAndDrop">Drag and drop PDF
           files here, or click to select</p>