fix(web): 工具箱导航指向 T6 落地页 /toolbox（替换旧 /skills）

apps/web/lib/nav/ai-tools.ts

@@ -24,6 +24,6 @@ export function aiToolItems(projectId: string): AiToolItem[] {
     { href: `${base}/review`, label: "审稿", glyph: "✦", key: "review" },
     { href: `${base}/outline`, label: "大纲", glyph: "❡", key: "outline" },
     { href: `${base}/codex`, label: "设定库", glyph: "❖", key: "codex" },
-    { href: `${base}/skills`, label: "工具箱", glyph: "✧", key: "skills" },
+    { href: `${base}/toolbox`, label: "工具箱", glyph: "✧", key: "toolbox" },
   ];
 }