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.

test.js

@@ -4,8 +4,8 @@
  * Repository: https://github.com/Shineii86/MiruroAPI
  *
  * @description
- *   Integration test suite for MiruroAPI v2.1.4 endpoints.
- *   Tests all 44 endpoints for correct response format.
+ *   Integration test suite for MiruroAPI v2.3.0 endpoints.
+ *   Tests all 45 endpoints for correct response format.
  *   Runs sequentially to avoid rate limiting.
  *
  * @author  Shinei Nouzen
@@ -152,7 +152,7 @@ async function runTest(test) {
  *   API_URL=http://localhost:3000/api node test.js  # Run against local
  */
 async function runAll() {
-  console.log(`\n🧪 MiruroAPI v2.1.4 — Running ${tests.length} tests...\n`);
+  console.log(`\n🧪 MiruroAPI v2.3.0 — Running ${tests.length} tests...\n`);
 
   // NOTE: Sequential execution — parallel requests would hit rate limiter
   for (const test of tests) {