feat: 在同步仓库脚本中添加自动合并消息功能，优化合并流程

自动同步仓库.ps1

@@ -74,14 +74,19 @@ function Sync-Repositories {
         } else {
             Write-ColorOutput "正在使用merge合并代码..." "Green"
             if (-not $DryRun) {
-                git merge upstream/master
+                # 生成自动合并消息
+                $timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
+                $mergeMessage = "feat: 同步上游仓库更新 ($timestamp)"
+                
+                git merge upstream/master --no-edit -m $mergeMessage
                 if ($LASTEXITCODE -ne 0) {
                     Write-ColorOutput "Merge失败！请手动解决冲突后再继续。" "Red"
                     Write-ColorOutput "解决冲突后请运行: git commit" "Yellow"
                     return
                 }
+                Write-ColorOutput "使用自动合并消息: $mergeMessage" "Gray"
             } else {
-                Write-ColorOutput "[预览模式] git merge upstream/master" "Gray"
+                Write-ColorOutput "[预览模式] git merge upstream/master --no-edit -m '自动合并消息'" "Gray"
             }
         }