feat: add on-demand folder size calculation in file manager (#1201)

* Initial plan

* feat: add folder size calculation feature with "Calculate" link

- Backend: Add Size API to calculate directory size
- Backend: Modify formatDir to return empty size for directories
- Frontend: Show "Calculate" link for directories instead of size
- Frontend: Add loading spinner during calculation
- Frontend: Cache calculated sizes until path changes
- Add translations for Calculate and Failed to calculate size

Co-authored-by: devhaozi <115467771+devhaozi@users.noreply.github.com>

* fix: lint

* fix: 优化

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: devhaozi <115467771+devhaozi@users.noreply.github.com>
Co-authored-by: 耗子 <haozi@loli.email>

internal/route/http.go

@@ -403,6 +403,7 @@ func (route *Http) Register(r *chi.Mux) {
 			r.Get("/download", route.file.Download)
 			r.Post("/remote_download", route.file.RemoteDownload)
 			r.Get("/info", route.file.Info)
+			r.Get("/size", route.file.Size)
 			r.Post("/permission", route.file.Permission)
 			r.Post("/compress", route.file.Compress)
 			r.Post("/un_compress", route.file.UnCompress)

internal/service/file.go

@@ -18,6 +18,7 @@ import (
 	"github.com/leonelquinteros/gotext"
 	"github.com/libtnb/chix"
 	"github.com/libtnb/utils/file"
+	"github.com/spf13/cast"
 
 	"github.com/acepanel/panel/internal/app"
 	"github.com/acepanel/panel/internal/biz"
@@ -327,6 +328,37 @@ func (s *FileService) Info(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
+// Size 计算大小
+func (s *FileService) Size(w http.ResponseWriter, r *http.Request) {
+	req, err := Bind[request.FilePath](r)
+	if err != nil {
+		Error(w, http.StatusInternalServerError, "%v", err)
+		return
+	}
+
+	info, err := stdos.Stat(req.Path)
+	if err != nil {
+		Error(w, http.StatusInternalServerError, "%v", err)
+		return
+	}
+	if !info.IsDir() {
+		// 如果不是目录，直接返回文件大小
+		Success(w, chix.M{
+			"size": tools.FormatBytes(float64(info.Size())),
+		})
+		return
+	}
+
+	// 计算目录大小
+	output, err := shell.Execf("du -sb '%s' | awk '{print $1}'", req.Path)
+	if err != nil {
+		Error(w, http.StatusInternalServerError, "%v", err)
+		return
+	}
+
+	Success(w, tools.FormatBytes(cast.ToFloat64(output)))
+}
+
 func (s *FileService) Permission(w http.ResponseWriter, r *http.Request) {
 	req, err := Bind[request.FilePermission](r)
 	if err != nil {
@@ -458,10 +490,15 @@ func (s *FileService) formatDir(base string, entries []stdos.DirEntry) []any {
 		}
 
 		stat := info.Sys().(*syscall.Stat_t)
+		// 对于目录，size 返回空字符串，需要用户手动计算
+		size := ""
+		if !info.IsDir() {
+			size = tools.FormatBytes(float64(info.Size()))
+		}
 		paths = append(paths, map[string]any{
 			"name":     info.Name(),
 			"full":     filepath.Join(base, info.Name()),
-			"size":     tools.FormatBytes(float64(info.Size())),
+			"size":     size,
 			"mode_str": info.Mode().String(),
 			"mode":     fmt.Sprintf("%04o", info.Mode().Perm()),
 			"owner":    os.GetUser(stat.Uid),