feat: Add VitePress docs, EPUB to PDF tool, Phosphor icons, and licensing updates

- Set up VitePress documentation site (docs:dev, docs:build, docs:preview)
- Added Getting Started, Tools Reference, Contributing, and Commercial License pages
- Created self-hosting guides for Docker, Vercel, Netlify, Cloudflare, AWS, Hostinger, Nginx, Apache
- Updated README with documentation link, sponsors section, and docs contribution guide

- Added EPUB to PDF converter using LibreOffice WASM

- Migrated to Phosphor Icons for consistent iconography

- Added donation ribbon banner on landing page
- Removed 'Like My Work?' section (replaced by ribbon)
- Updated licensing.html with delivery model, AGPL notice, invoicing, and no-refund policy

- Added Commercial License documentation page
- Updated translations table (Chinese added, marked non-English as In Progress)

- Added sponsors.yml workflow for auto-generating sponsor avatars

src/pages/jpg-to-pdf.html

@@ -75,7 +75,7 @@
 
             <h1 class="text-2xl font-bold text-white mb-2" data-i18n="tools:jpgToPdf.name">JPG to PDF</h1>
             <p class="text-gray-400 mb-6" data-i18n="tools:jpgToPdf.subtitle">
-                Convert one or more JPG images into a single PDF file.
+                Create a PDF from JPG, JPEG, and JPEG2000 (JP2/JPX) images.
             </p>
 
             <!-- Drop Zone -->
@@ -86,12 +86,12 @@
                     <p class="mb-2 text-sm text-gray-400"><span class="font-semibold"
                             data-i18n="upload.clickToSelect">Click to select a file</span> <span
                             data-i18n="upload.orDragAndDrop">or drag and drop</span></p>
-                    <p class="text-xs text-gray-500">JPG Images</p>
+                    <p class="text-xs text-gray-500">JPG, JPEG, JP2, JPX Images</p>
                     <p class="text-xs text-gray-500" data-i18n="upload.filesNeverLeave">Your files never leave your
                         device.</p>
                 </div>
                 <input id="file-input" type="file" class="absolute top-0 left-0 w-full h-full opacity-0 cursor-pointer"
-                    multiple accept="image/jpeg, image/jpg">
+                    multiple accept="image/jpeg, image/jpg, image/jp2, .jp2, .jpx, .jpeg, .jpg">
             </div>
 
             <!-- Control buttons -->
@@ -101,8 +101,8 @@
                     <i data-lucide="plus"></i> <span data-i18n="upload.addMore">Add More Files</span>
                 </button>
                 <button id="clear-files-btn"
-                    class="btn bg-red-600 hover:bg-red-700 text-white font-semibold px-4 py-2 rounded-lg flex items-center gap-2">
-                    <i data-lucide="x"></i> <span data-i18n="upload.clearAll">Clear All</span>
+                    class="btn bg-gray-700 hover:bg-gray-600 text-white font-semibold px-4 py-2 rounded-lg flex items-center gap-2">
+                    <i data-lucide="trash-2"></i> <span data-i18n="upload.clearAll">Clear All</span>
                 </button>
             </div>