v1.8.0: Full diagnostic sweep - 20 bugs fixed

Critical fixes:
- extractPages.helper.js: Pagination URL bug (?page → &page)
- package.json: Fixed invalid dep versions (axios, dotenv, express)
- privacy.html + tos.html: Broken footer links (//tos → /tos)
- manifest.json: Invalid icon purpose (any maskable → maskable)

High fixes:
- server.js: Removed duplicate CORS middleware (triple → single)
- search.controller.js: Cache key collision with suggestion controller
- apiRoutes.js: Dynamic endpoint count (was hardcoded 27)
- vercel.json: Removed duplicate CORS header

Medium fixes:
- header.config.js: Updated User-Agent to Chrome 130
- dataUrl.js: Removed redundant domain from ALT_DOMAINS
- category.extractor.js: Removed unused cheerio import
- server.js: Added __dirname, removed unused cors import

Documentation:
- CHANGELOG.md: Added v1.8.0 entry
- README.md: Updated version badges (1.8.0, Express 4.21)
- test.js: Fixed status endpoint (currently-airing → airing)

public/privacy.html

@@ -78,6 +78,6 @@
     <h2>8. Contact</h2>
     <p>For questions about this Privacy Policy, open an issue at <a href="https://github.com/Shineii86/AniKotoAPI/issues" target="_blank">github.com/Shineii86/AniKotoAPI/issues</a>.</p>
   </div>
-  <footer>&copy; 2026 AniKotoAPI &middot; <a href="/" style="color:var(--purple)">Home</a> &middot; <a href="//tos" style="color:var(--purple)">Terms</a></footer>
+  <footer>&copy; 2026 AniKotoAPI &middot; <a href="/" style="color:var(--purple)">Home</a> &middot; <a href="/tos" style="color:var(--purple)">Terms</a></footer>
 </body>
 </html>