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/js/i18n/i18n.ts

@@ -44,7 +44,7 @@ export const initI18n = async (): Promise<typeof i18next> => {
             ns: ['common', 'tools'],
             defaultNS: 'common',
             backend: {
-                loadPath: `${import.meta.env.BASE_URL}locales/{{lng}}/{{ns}}.json`,
+                loadPath: `${import.meta.env.BASE_URL.replace(/\/?$/, '/')}locales/{{lng}}/{{ns}}.json`,
             },
             detection: {
                 order: ['path', 'localStorage', 'navigator'],