refactor: clean up obsolete files and update imports

Remove obsolete files and update remaining imports:

- Delete scripts/oklch-to-hex.mjs (no longer needed)
- Delete src/lib/articles.ts (replaced by generated/articles.ts)
- Delete src/lib/docs.ts (replaced by generated/docs.ts)
- Update articles/page.tsx to use generated imports
- Update docs/page.tsx to use generated imports

These changes complete the refactoring to auto-generated metadata files.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: ericyangpan

scripts/oklch-to-hex.mjs

@@ -1,7 +1,7 @@
 import Link from 'next/link';
 import Header from '@/components/Header';
 import Footer from '@/components/Footer';
-import { getArticles } from '@/lib/articles';
+import { getArticles } from '@/lib/generated/articles';
 import { getTranslations } from 'next-intl/server';
 import { buildCanonicalUrl, buildOpenGraph, buildTwitterCard, buildTitle } from '@/lib/metadata';
 

src/app/[locale]/articles/page.tsx

@@ -1,7 +1,7 @@
 import Header from '@/components/Header';
 import Footer from '@/components/Footer';
 import DocsSidebar from '@/components/sidebar/DocsSidebar';
-import { getDocSections, getDocComponents } from '@/lib/docs';
+import { getDocSections, getDocComponents } from '@/lib/generated/docs';
 import { getTranslations } from 'next-intl/server';
 import { buildCanonicalUrl, buildOpenGraph, buildTwitterCard, buildTitle } from '@/lib/metadata';