feat: add Open Graph image generation and SEO metadata

- Introduced `PageSeo` component for managing page metadata for social sharing.
- Created Open Graph image templates using SVG and static fonts for better visual representation.
- Implemented service alert management with functions to check active alerts and format route numbers.
- Added utility functions for generating and watching alert validity.
- Developed a script to generate Open Graph images dynamically based on page content.
- Included tests for service alert functionalities to ensure correctness and reliability.

modules/legal/content.ts

@@ -1,4 +1,4 @@
-import { Locales } from '@/utils/useLocale';
+import type { Locales } from '@/utils/useLocale';
 
 export type LegalDocumentId = 'privacy' | 'terms';