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.

docs/endpoints.md

@@ -1,6 +1,6 @@
 # API Endpoints Reference
 
-Complete documentation for all 35 MiruroAPI v2.0.1 endpoints.
+Complete documentation for all 45 MiruroAPI v2.3.0 endpoints.
 
 ---
 
@@ -591,12 +591,12 @@ API health status, version, uptime, memory, cache stats.
   "success": true,
   "results": {
     "status": "healthy",
-    "version": "2.0.0",
+    "version": "2.3.0",
     "uptime": "0h 0m 34s",
     "node": "v24.14.1",
     "memory": { "used": "13MB", "total": "15MB", "rss": "25MB" },
     "cache": { "size": 12, "maxSize": 100 },
-    "endpoints": 35,
+    "endpoints": 45,
     "providers": ["kiwi","pewe","bee","bonk","bun","ally","nun","twin","cog","moo","hop","telli"]
   }
 }
@@ -604,6 +604,16 @@ API health status, version, uptime, memory, cache stats.
 
 ---
 
+## Pipe Health
+
+```
+GET /api/pipe-health
+```
+
+Returns the status of the self-healing fallback system — mirror availability, ScraperAPI/FlareSolverr status, and last successful method.
+
+---
+
 ## Stats
 
 ```