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.

api/proxy.js

@@ -120,7 +120,7 @@ const decodePruUrl = (pruUrl) => {
  * @returns {string} Full PRU proxy URL
  *
  * @example
- *   const pruUrl = encodeForPru("https://cdn.example.com/v.m3u8", "https://miruro.tv/");
+ *   const pruUrl = encodeForPru("https://cdn.example.com/v.m3u8", "https://miruro.to/");
  */
 const encodeForPru = (rawUrl, referer) => {
   const urlEnc = base64urlXor(rawUrl);
@@ -189,7 +189,7 @@ const rewriteM3U8 = (m3u8, targetReferer) => {
  * @query {string} referer - Optional referer header for the target
  *
  * @example
- *   GET /api/proxy?url=https://example.com/video.m3u8&referer=https://miruro.tv/
+ *   GET /api/proxy?url=https://example.com/video.m3u8&referer=https://miruro.to/
  */
 module.exports = async function handler(req, res) {
   // NOTE: CORS headers for browser requests