chore: add changeset for examples and add-on metadata updates

Author: tannerlinsley

.changeset/strong-comics-double.md

@@ -0,0 +1,11 @@
+---
+'@tanstack/cli': patch
+'@tanstack/create': patch
+---
+
+Improve scaffold customization and custom add-on authoring flow.
+
+- Add `--examples` / `--no-examples` support to include or omit demo/example pages during app creation.
+- Prompt for add-on-declared environment variables during interactive create and seed entered values into generated `.env.local`.
+- Ensure custom add-on/starter metadata consistently includes a `version`, with safe backfill for older metadata files.
+- Align bundled starter/example metadata and docs with current Start/file-router behavior.