feat(polaris): 实现静态分类页

新增七个预生成分类路由、工具卡片网格与空状态。启用侧栏分类导航和当前分类选中态，修复 Windows 静态导出 RSC 路径并补充产物验证，保持静态导出与安全外链约束。

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

ts/web/nextjs/polaris/src/features/navigation/components/app-shell.test.tsx

@@ -139,7 +139,7 @@ describe("AppShell", () => {
     )
   })
 
-  it("分类项可聚焦但保持禁用", () => {
+  it("首页默认选中并启用分类链接", () => {
     render(
       <AppShell
         categories={categories}
@@ -150,13 +150,52 @@ describe("AppShell", () => {
       </AppShell>,
     )
 
-    expect(
-      screen.getByRole("button", {
-        name: "开发工具，分类页将在下一阶段提供",
-      }),
-    ).toHaveAttribute("aria-disabled", "true")
-    expect(
-      screen.queryByRole("link", { name: /开发工具/ }),
-    ).not.toBeInTheDocument()
+    expect(screen.getByRole("link", { name: "首页" })).toHaveAttribute(
+      "aria-current",
+      "page",
+    )
+    expect(screen.getByRole("link", { name: "开发工具" })).toHaveAttribute(
+      "href",
+      "/categories/dev",
+    )
+  })
+
+  it("分类页只选中当前分类", () => {
+    render(
+      <AppShell
+        categories={categories}
+        siteName="Polaris"
+        defaultCollapsed={false}
+        activeCategoryId="dev"
+      >
+        <main>分类内容</main>
+      </AppShell>,
+    )
+
+    expect(screen.getByRole("link", { name: "首页" })).not.toHaveAttribute(
+      "aria-current",
+    )
+    expect(screen.getByRole("link", { name: "开发工具" })).toHaveAttribute(
+      "aria-current",
+      "page",
+    )
+  })
+
+  it("折叠状态仍保留分类链接的可访问名称", () => {
+    render(
+      <AppShell
+        categories={categories}
+        siteName="Polaris"
+        defaultCollapsed={true}
+        activeCategoryId="dev"
+      >
+        <main>分类内容</main>
+      </AppShell>,
+    )
+
+    expect(screen.getByRole("link", { name: "开发工具" })).toHaveAttribute(
+      "aria-current",
+      "page",
+    )
   })
 })