fix(cli): extend pnpm 11 build-script allowlists across app templates

- Add packages: [] to single-app pnpm-workspace.yaml so pnpm 9 does
  not reject the file with "packages field missing or empty".
- Add astro-app, react-router-app, start-app, next-app workspace
  yamls with the build-script allowlist each template needs
  (esbuild, sharp, unrs-resolver as applicable).
- Set msw: false across all app allowlists so the registry component
  install runs cleanly under pnpm 11 without executing msw's
  service-worker postinstall.
- Add a scaffold test pinning the packages:[] + allowBuilds shape
  so the parser keeps treating it as single-app.

packages/shadcn/src/utils/scaffold.test.ts

@@ -348,6 +348,47 @@ describe("defaultScaffold", () => {
     expect(written.workspaces).toBeUndefined()
   })
 
+  it("should treat single-app workspace yaml (packages:[] + allowBuilds) as non-monorepo", async () => {
+    vi.mocked(fs.existsSync).mockImplementation((p: any) => {
+      const s = p.toString()
+      return s.includes("pnpm-workspace.yaml") || s.includes("package.json")
+    })
+
+    vi.mocked(fs.readFile).mockImplementation(((filePath: string) => {
+      if (filePath.includes("pnpm-workspace.yaml")) {
+        return Promise.resolve(
+          "packages: []\n\nallowBuilds:\n  esbuild: true\n"
+        )
+      }
+      return Promise.resolve(
+        JSON.stringify({ name: "my-app", packageManager: "pnpm@9.0.0" })
+      )
+    }) as any)
+
+    const template = createTestTemplate()
+
+    await template.scaffold({
+      projectPath: "/test/my-app",
+      packageManager: "npm",
+      cwd: "/test",
+    })
+
+    // Inline empty packages array must not be parsed as a monorepo;
+    // the yaml is stripped and no workspaces array is added.
+    expect(vi.mocked(fs.remove)).toHaveBeenCalledWith(
+      path.join("/test/my-app", "pnpm-workspace.yaml")
+    )
+
+    const writeCalls = vi.mocked(fs.writeFile).mock.calls
+    const adaptCall = writeCalls.find(
+      (call) => call[0] === path.join("/test/my-app", "package.json")
+    )
+    expect(adaptCall).toBeDefined()
+    const written = JSON.parse(adaptCall![1] as string)
+    expect(written.packageManager).toBeUndefined()
+    expect(written.workspaces).toBeUndefined()
+  })
+
   it("should rewrite workspace: protocol refs to * for npm monorepo", async () => {
     vi.mocked(fs.existsSync).mockImplementation((p: any) => {
       const s = p.toString()

templates/astro-app/pnpm-workspace.yaml

@@ -0,0 +1,6 @@
+packages: []
+
+allowBuilds:
+  esbuild: true
+  sharp: true
+  msw: false

templates/next-app/pnpm-workspace.yaml

@@ -0,0 +1,6 @@
+packages: []
+
+allowBuilds:
+  sharp: true
+  unrs-resolver: true
+  msw: false

templates/react-router-app/pnpm-workspace.yaml

@@ -0,0 +1,5 @@
+packages: []
+
+allowBuilds:
+  esbuild: true
+  msw: false

templates/start-app/pnpm-workspace.yaml

@@ -0,0 +1,6 @@
+packages: []
+
+allowBuilds:
+  esbuild: true
+  unrs-resolver: true
+  msw: false

templates/vite-app/pnpm-workspace.yaml

@@ -1,2 +1,5 @@
+packages: []
+
 allowBuilds:
   esbuild: true
+  msw: false