feat: add zip download for folders in file manager

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/controllers/file_controller.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"github.com/engigu/baihu-panel/internal/utils"
 
@@ -492,3 +493,50 @@ func (fc *FileController) DownloadFile(c *gin.Context) {
 	c.Header("Content-Type", "application/octet-stream")
 	c.File(fullPath)
 }
+
+func (fc *FileController) DownloadZip(c *gin.Context) {
+	paths := c.QueryArray("path")
+	if len(paths) == 0 || c.ContentType() == "application/json" {
+		var req struct {
+			Paths []string `json:"paths"`
+		}
+		if err := c.ShouldBindJSON(&req); err == nil && len(paths) == 0 {
+			paths = req.Paths
+		}
+	}
+
+	if len(paths) == 0 {
+		utils.BadRequest(c, "path参数必填")
+		return
+	}
+
+	validatedAbsPaths := make([]string, 0, len(paths))
+	for _, path := range paths {
+		fullPath, safe := fc.checkPath(path, false)
+		if !safe {
+			utils.Forbidden(c, "访问被拒绝")
+			return
+		}
+
+		if _, err := os.Stat(fullPath); err != nil {
+			utils.NotFound(c, "文件不存在")
+			return
+		}
+
+		validatedAbsPaths = append(validatedAbsPaths, fullPath)
+	}
+
+	fileName := "baihu-export-" + time.Now().Format("20060102-150405") + ".zip"
+	if len(validatedAbsPaths) == 1 {
+		fileName = filepath.Base(validatedAbsPaths[0]) + ".zip"
+	}
+
+	c.Header("Content-Description", "File Transfer")
+	c.Header("Content-Transfer-Encoding", "binary")
+	c.Header("Content-Disposition", "attachment; filename="+fileName)
+	c.Header("Content-Type", "application/zip")
+
+	if err := utils.CreateZip(c.Writer, validatedAbsPaths); err != nil {
+		return
+	}
+}