chore: bump version to v1.2.9

- feat: batch change login email
- feat: batch change recovery email
- fix: various bug fixes
- feat: minor feature enhancements

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Directory.Build.props

@@ -5,10 +5,10 @@
     <!-- 主版本: 重大变更/不兼容更新 -->
     <!-- 次版本: 新功能/兼容性更新 -->
     <!-- 修订号: Bug修复/小改进 -->
-    <Version>1.2.8</Version>
-    <AssemblyVersion>1.2.8.0</AssemblyVersion>
-    <FileVersion>1.2.8.0</FileVersion>
-    <InformationalVersion>1.2.8</InformationalVersion>
+    <Version>1.2.9</Version>
+    <AssemblyVersion>1.2.9.0</AssemblyVersion>
+    <FileVersion>1.2.9.0</FileVersion>
+    <InformationalVersion>1.2.9</InformationalVersion>
 
     <!-- 项目元信息 -->
     <Authors>Telegram Panel Contributors</Authors>