feat(xtream-proxy): rewrite proxy logic and update configuration format

Refactor the xtream-proxy from a single-file Express-based server to a
modular Node.js application using native http/https modules. This
change introduces a major version bump to 2.0.0.

- Replace `hosts.txt` with `upstreams.json` for configuration
- Remove heavy dependencies (`express`, `ws`) in favor of native modules
- Implement new environment variables for proxy credentials and timeouts
- Add `src/` directory for modular code structure
- Add `docker-compose.example.yml` for easier deployment
- Update Dockerfile to support the new directory structure and environment
- Improve error handling and probe logic for upstream selection

Dockers/xtream-proxy/package.json

@@ -1,12 +1,12 @@
 {
   "name": "xtream-proxy",
-  "version": "1.0.0",
+  "version": "2.0.0",
   "private": true,
+  "description": "Proxies the fastest available upstream from a list of Xtream Codes credentials",
   "scripts": {
     "start": "node server.js"
   },
-  "dependencies": {
-    "express": "^4.21.0",
-    "ws": "^8.18.0"
+  "engines": {
+    "node": ">=20"
   }
 }