Add one-click panel auto-update from git.evilfox.cc (v2.4.0).

Check Gitea releases in Settings and install the latest tag via git fetch/checkout with pip sync and restart when running from a git checkout.

README.md

@@ -85,6 +85,8 @@ Configuration panel for system parameters and preferences:
 *   **🌐 Internationalization (i18n)**:
     *   Full support for **English**, **Russian**, **French**, **Chinese**, and **Persian**.
     *   Native **RTL (Right-to-Left)** support for Persian language.
+*   **🔄 Auto-update**:
+    *   Settings → About checks releases on [git.evilfox.cc](https://git.evilfox.cc/test2/Amnezia-Web-Panel-main) and can install the latest tag via git + restart (when the panel runs from a git checkout).
 *   **👥 Advanced User Management**:
     *   Role-based access (Admin, Support, Regular User).
     *   Traffic limits, status monitoring, and account expiration.
@@ -222,6 +224,9 @@ GitHub Actions workflows in `.github/workflows/`:
 
 ## 📋 Fix / changelog (this fork)
 
+### v2.4.0
+*   **Auto-update from Gitea**: Settings → About checks https://git.evilfox.cc/test2/Amnezia-Web-Panel-main releases and can install the latest tag via `git fetch` + checkout, then restart (git install only).
+
 ### v2.3.0
 *   **Cascade removed** — double-VPN feature dropped from the panel (manager, API, UI, i18n).