update

internal/handler/templates.go

@@ -19,6 +19,7 @@ import (
 	"bytes"
 	"context"
 	"embed"
+	"fmt"
 	"html/template"
 	"io/fs"
 	"net/http"
@@ -41,6 +42,25 @@ func SetImgComposer(c *imgurl.Composer) {
 	}
 }
 
+// formatBytes 把字节数格式化为人类可读串（B/KB/MB/GB/TB）；0 或负数返回「—」。
+func formatBytes(n int64) string {
+	if n <= 0 {
+		return "—"
+	}
+	const unit = 1024
+	if n < unit {
+		return fmt.Sprintf("%d B", n)
+	}
+	val := float64(n)
+	for _, u := range []string{"KB", "MB", "GB", "TB"} {
+		val /= unit
+		if val < unit {
+			return fmt.Sprintf("%.1f %s", val, u)
+		}
+	}
+	return fmt.Sprintf("%.1f PB", val)
+}
+
 //go:embed templates/layout.html templates/partials.html templates/pages/*.html assets/*
 var backstageFS embed.FS
 
@@ -60,6 +80,7 @@ func init() {
 		// imgThumb 同但走列表缩略图样式（小尺寸场景省流量）。两者兜底逻辑见 imgurl.Composer。
 		"imgURL":    func(stored string) string { return imgComposer.Compose(stored) },
 		"imgThumb":  func(stored string) string { return imgComposer.ComposeThumb(stored) },
+		"formatBytes": formatBytes,
 	}
 
 	base, err := template.New("layout.html").Funcs(funcs).