feat: enable update system with localhost:8000 server

appcast.xml

@@ -2,6 +2,64 @@
 <rss version="2.0" xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle">
     <channel>
         <title>Umbrix Updates</title>
-        <!-- No updates available - this is Umbrix, not Hiddify -->
+        <description>Umbrix VPN автообновления</description>
+        <link>http://localhost:8000</link>
+        <language>ru</language>
+        
+        <!-- Пример структуры для обновления версии 2.5.8 -->
+        <!-- Раскомментируйте и измените, когда будет новая версия -->
+        <!--
+        <item>
+            <title>Umbrix 2.5.8</title>
+            <description>🚀 Новые функции:
+- Улучшена стабильность
+- Исправлены ошибки</description>
+            <pubDate>Sat, 18 Jan 2026 06:00:00 +0000</pubDate>
+            <sparkle:version>2.5.8</sparkle:version>
+            <sparkle:shortVersionString>2.5.8</sparkle:shortVersionString>
+            <sparkle:minimumSystemVersion>2.0.0</sparkle:minimumSystemVersion>
+            
+            <!-- Linux DEB (Debian/Ubuntu) -->
+            <enclosure
+                url="http://localhost:8000/downloads/umbrix-2.5.8-linux.deb"
+                sparkle:version="2.5.8"
+                sparkle:os="linux-deb"
+                type="application/x-debian-package"
+                length="30000000" />
+            
+            <!-- Linux RPM (Fedora/CentOS) -->
+            <enclosure
+                url="http://localhost:8000/downloads/umbrix-2.5.8-linux.rpm"
+                sparkle:version="2.5.8"
+                sparkle:os="linux-rpm"
+                type="application/x-rpm"
+                length="36000000" />
+            
+            <!-- Linux AppImage (Universal) -->
+            <enclosure
+                url="http://localhost:8000/downloads/umbrix-2.5.8-linux.AppImage"
+                sparkle:version="2.5.8"
+                sparkle:os="linux-appimage"
+                type="application/x-appimage"
+                length="38000000" />
+            
+            <!-- Windows EXE -->
+            <enclosure
+                url="http://localhost:8000/downloads/umbrix-2.5.8-windows.exe"
+                sparkle:version="2.5.8"
+                sparkle:os="windows"
+                type="application/x-msdownload"
+                length="45000000" />
+        </item>
+        -->
+        
+        <!-- Текущая версия 1.7.0 (без обновлений) -->
+        <item>
+            <title>Umbrix 1.7.0</title>
+            <description>Стабильный релиз</description>
+            <pubDate>Fri, 17 Jan 2026 08:49:07 +0000</pubDate>
+            <sparkle:version>1.7.0</sparkle:version>
+            <sparkle:shortVersionString>1.7.0</sparkle:shortVersionString>
+        </item>
     </channel>
 </rss>