Run oxfmt across repo, add format script and docs

Add .oxfmtignore to skip generated bindings and wasm-pack output.
Add npm format script, update DEVELOPMENT.md for Vite+ toolchain,
and format all non-generated files with oxfmt.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

crates/yaak-models/guest-js/util.ts

@@ -1,4 +1,4 @@
-import { ModelStoreData } from './types';
+import { ModelStoreData } from "./types";
 
 export function newStoreData(): ModelStoreData {
   return {