feat: 实现纹理图集生成功能

添加纹理图集生成工具，支持多图片合并为单个图集并生成坐标数据文件

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/layout/Sidebar.tsx

@@ -8,6 +8,7 @@ import {
   Image,
   Music,
   LayoutDashboard,
+  Layers,
 } from "lucide-react";
 import { cn } from "@/lib/utils";
 import { useTranslation, getServerTranslations } from "@/lib/i18n";
@@ -36,6 +37,7 @@ function useSidebarNavItems() {
         { name: getT("sidebar.videoToFrames"), href: "/tools/video-frames", icon: Video },
         { name: getT("sidebar.imageCompression"), href: "/tools/image-compress", icon: Image },
         { name: getT("sidebar.audioCompression"), href: "/tools/audio-compress", icon: Music },
+        { name: getT("sidebar.textureAtlas"), href: "/tools/texture-atlas", icon: Layers },
       ],
     },
   ];