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

docs/self-hosting/cloudflare.md

@@ -0,0 +1,78 @@
+# Deploy to Cloudflare Pages
+
+[Cloudflare Pages](https://pages.cloudflare.com) offers fast, global static site hosting with unlimited bandwidth.
+
+## Quick Deploy
+
+1. Go to [Cloudflare Pages](https://dash.cloudflare.com/?to=/:account/pages)
+2. Click "Create a project"
+3. Connect your GitHub repository
+
+## Build Configuration
+
+| Setting | Value |
+|---------|-------|
+| Framework preset | None |
+| Build command | `npm run build` |
+| Build output directory | `dist` |
+| Root directory | `/` |
+
+## Environment Variables
+
+Add these in Settings → Environment variables:
+
+| Variable | Value |
+|----------|-------|
+| `NODE_VERSION` | `18` |
+| `SIMPLE_MODE` | `false` (optional) |
+
+## Configuration File
+
+Create `_headers` in your `public` folder:
+
+```
+# Cache WASM files aggressively
+/*.wasm
+  Cache-Control: public, max-age=31536000, immutable
+  Content-Type: application/wasm
+
+# Service worker
+/sw.js
+  Cache-Control: no-cache
+```
+
+Create `_redirects` for SPA routing:
+
+```
+/*    /index.html   200
+```
+
+## Custom Domain
+
+1. Go to your Pages project
+2. Click "Custom domains"
+3. Add your domain
+4. Cloudflare will auto-configure DNS if the domain is on Cloudflare
+
+## Advantages
+
+- **Free unlimited bandwidth**
+- **Global CDN** with 300+ edge locations
+- **Automatic HTTPS**
+- **Preview deployments** for pull requests
+- **Fast builds**
+
+## Troubleshooting
+
+### Large File Uploads
+
+Cloudflare Pages supports files up to 25 MB. WASM modules should be fine, but if you hit limits, consider:
+
+```bash
+# Split large files during build
+npm run build
+```
+
+### Worker Size Limits
+
+If using Cloudflare Workers for advanced routing, note the 1 MB limit for free plans.