feat(examples): scaffold coding-agent example

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

examples/coding-agent/src/App.tsx

@@ -0,0 +1,13 @@
+import { defineComponent } from "vue";
+import { Box, Text } from "@vue-tui/runtime";
+
+export default defineComponent(() => {
+  return () => (
+    <Box flexDirection="column" paddingX={1}>
+      <Text bold color="cyan">
+        coding-agent
+      </Text>
+      <Text dimColor>scaffold works</Text>
+    </Box>
+  );
+});