Simplify install command in README, add English version

Domain arguments dropped from the quick-start command (the installer
prompts for them). English translation lives in README_EN.md, both
files cross-link.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -1,5 +1,7 @@
 # 3x-ui-pro
 
+🇬🇧 [English version](README_EN.md)
+
 Автоматическая установка панели [3x-ui](https://github.com/MHSanaei/3x-ui) с nginx, SSL, Clash-подпиской и диагностикой сети.
 
 - Debian 12 / Ubuntu 24
@@ -34,11 +36,9 @@ wget -qO x-ui-latest.sh https://raw.githubusercontent.com/mozaroc/3x-ui-pro/main
 **Шаг 2 — запустить**
 
 ```bash
-bash x-ui-latest.sh -install y -subdomain panel.example.com -reality_domain r.example.com
+bash x-ui-latest.sh -install y
 ```
 
-Замените `panel.example.com` на домен панели, `r.example.com` — на домен для REALITY.
-
 ---
 ## Патч
 

README_EN.md

@@ -0,0 +1,120 @@
+# 3x-ui-pro
+
+🇷🇺 [Русская версия](README.md)
+
+Automated installer for the [3x-ui](https://github.com/MHSanaei/3x-ui) panel with nginx, SSL, Clash subscription and network diagnostics.
+
+- Debian 12 / Ubuntu 24
+- Two domains or subdomains (one for the panel, one for REALITY)
+- Automatic SSL certificate renewal
+- VLESS+REALITY, VLESS+WebSocket, VLESS+XHTTP, Trojan+gRPC — all through port 443
+
+---
+
+## What gets installed
+
+| Component | Description |
+|-----------|-------------|
+| 3x-ui | VPN panel with web UI |
+| nginx | Reverse proxy, SNI routing |
+| certbot | Let's Encrypt SSL |
+| Clash subscription | Serves `clash.yaml` based on User-Agent |
+| Diagnostics | MTR tracer + in-browser speed test |
+| Fake site | Random HTML cover site |
+| Backup | Backup / restore script |
+
+---
+
+## Installation
+
+**Step 1 — download the script**
+
+```bash
+wget -qO x-ui-latest.sh https://raw.githubusercontent.com/mozaroc/3x-ui-pro/main/x-ui-latest.sh
+```
+
+**Step 2 — run it**
+
+```bash
+bash x-ui-latest.sh -install y
+```
+
+---
+## Patch
+
+Apply current fixes to an existing installation (no DB changes):
+
+```bash
+bash <(curl -fsSL https://raw.githubusercontent.com/mozaroc/3x-ui-pro/main/x-ui-patch.sh)
+```
+
+---
+
+## Uninstall
+
+```bash
+bash x-ui-latest.sh -uninstall y
+```
+
+---
+
+## Command-line options
+
+| Option | Description |
+|--------|-------------|
+| `-install y` | Install |
+| `-subdomain <domain>` | Panel and subscription domain |
+| `-reality_domain <domain>` | REALITY destination domain |
+| `-auto_domain y` | Auto-detect domain (no manual input) |
+| `-uninstall y` | Full uninstall |
+
+---
+
+## Clash subscription
+
+Works via User-Agent detection — one URL, different behavior:
+
+- **Clash / Mihomo / Stash** → get a ready-to-use `clash.yaml` config
+- **Regular browser / other clients** → get the standard 3x-ui subscription page
+
+The import link is printed by the script after installation.
+
+---
+
+## Backup and restore
+
+**Install the backup script**
+
+```bash
+wget -qO /usr/local/bin/x-ui-backup https://raw.githubusercontent.com/mozaroc/3x-ui-pro/main/assets/backup/x-ui-backup.sh
+chmod +x /usr/local/bin/x-ui-backup
+```
+
+**Create a backup**
+
+```bash
+x-ui-backup backup
+```
+
+**List backups**
+
+```bash
+x-ui-backup list
+```
+
+**Restore from a backup** (on a clean server; packages are installed automatically)
+
+```bash
+x-ui-backup restore /var/backups/x-ui/x-ui-backup-20260101-120000.tar.gz
+```
+
+The backup includes: nginx configs, panel DB, 3x-ui binary, SSL certificates, web content, systemd units, cron, UFW rules.
+
+---
+
+## Network diagnostics
+
+Available after installation at the link printed by the script. Includes:
+
+- MTR trace to your IP
+- Download and upload speed test (512 MB test files)