phsl / new-api

**Changes:**
- Replace React Router `Link` components with native `<a>` tags for external links in About and Footer components
- Add clickable links for "NewAPI", "QuantumNous", and "One API v0.5.4" in the About page
- Link "NewAPI" to the main project repository (https://github.com/QuantumNous/new-api)
- Link "QuantumNous" to the organization page (https://github.com/QuantumNous)
- Link "One API v0.5.4" to the specific release page (https://github.com/songquanpeng/one-api/releases/tag/v0.5.4)
- Apply consistent styling with primary color theme and hover effects across all links
- Add proper security attributes (`rel="noopener noreferrer"`) to all external links

**i18n Updates:**
- Refactor i18n translation keys to support the new link structure
- Split the original copyright string into smaller, reusable translation keys
- Add new translation keys: `"© {{currentYear}}"` and `"| 基于"`
- Maintain backward compatibility for existing translations

**Benefits:**
- Improved user experience with direct access to relevant project resources
- Better SEO and link accessibility
- Consistent visual styling across all external links
- Enhanced security for external link navigation
- Proper separation of concerns between internal routing and external navigation