test: add PTY console and useStdout fixture scripts + tests

Port console.log and useStdout.write fixtures from Ink to verify
patchConsole and useStdout().write() work correctly in a real terminal.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/runtime-tests/integration/pty/console.test.ts

@@ -0,0 +1,14 @@
+import { test, expect } from "vite-plus/test";
+import { run } from "./helpers/run.ts";
+
+test.sequential("console.log doesn't corrupt output", async () => {
+  const output = await run("console");
+  expect(output).toContain("First log");
+  expect(output).toContain("Second log");
+});
+
+test.sequential("useStdout.write in real terminal", async () => {
+  const output = await run("use-stdout");
+  expect(output).toContain("Hello from vue-tui to stdout");
+  expect(output).toContain("exited");
+});

packages/runtime-tests/integration/pty/fixtures/console.tsx

@@ -0,0 +1,20 @@
+import { createApp, Text } from "@vue-tui/runtime";
+import { defineComponent, h, onMounted, onScopeDispose } from "vue";
+
+const App = defineComponent(() => {
+  onMounted(() => {
+    const timer = setTimeout(() => {}, 1000);
+
+    onScopeDispose(() => {
+      clearTimeout(timer);
+    });
+  });
+
+  return () => h(Text, null, { default: () => "Hello World" });
+});
+
+const app = createApp(App);
+app.mount();
+console.log("First log");
+app.unmount();
+console.log("Second log");

packages/runtime-tests/integration/pty/fixtures/use-stdout.tsx

@@ -0,0 +1,19 @@
+import { createApp, Text, useStdout, useExit } from "@vue-tui/runtime";
+import { defineComponent, h, onMounted } from "vue";
+
+const WriteToStdout = defineComponent(() => {
+  const { write } = useStdout();
+  const exit = useExit();
+
+  onMounted(() => {
+    write("Hello from vue-tui to stdout\n");
+    exit();
+  });
+
+  return () => h(Text, null, { default: () => "Hello World" });
+});
+
+const app = createApp(WriteToStdout);
+app.mount();
+await app.waitUntilExit();
+console.log("exited");