docs: full sweep — update all files to v2.3.0 with self-healing system

Updated 14 files across the repo to reflect v2.3.0:
- README.md: version badge, 46 endpoints, self-healing section, changelog
- test.js: version 2.3.0
- docs/*: architecture, endpoints, index, streaming — multi-mirror + fallback
- public/*: index.html, docs.html, openapi.json, manifest.json, privacy, tos
- api/proxy.js: updated example comments
- src/routes/apiRoutes.js: endpoint count 36→46

All version refs updated from 2.1.4/2.2.0 → 2.3.0.
Endpoint count updated to 46 (added /pipe-health).
miruro.tv refs updated to multi-domain (miruro.to/ru/bz/tv).
Syntax checks pass on all JS files.

public/privacy.html

@@ -60,7 +60,7 @@
     </ul>
 
     <h2>3. Third-Party Data Sources</h2>
-    <p>The Service fetches data from <code>graphql.anilist.co</code> (AniList) and <code>miruro.tv</code> (streaming providers). This data (anime titles, descriptions, images, episode information) belongs to the respective content owners. We do not claim ownership of this data.</p>
+    <p>The Service fetches data from <code>graphql.anilist.co</code> (AniList) and Miruro streaming providers across multiple domains (<code>miruro.to</code>, <code>miruro.ru</code>, <code>miruro.bz</code>, <code>miruro.tv</code>). This data (anime titles, descriptions, images, episode information) belongs to the respective content owners. We do not claim ownership of this data.</p>
     <p>If you are a content owner and wish to have your data removed from this API, please open an issue on our <a href="https://github.com/Shineii86/MiruroAPI" target="_blank" rel="noopener noreferrer">GitHub repository</a>.</p>
 
     <h2>4. Data Storage</h2>