test(snap): exclude nested-oxc-config-proj-1 fixture from repo fmt

The repo-level `vp check --fix` lint-staged hook was reformatting the
snap test fixture to match the repo's own `singleQuote: true`, which
erased the double-quoted string the fmt reproduction depends on.
Exclude the fixture directory from the repo's `fmt.ignorePatterns`
and restore the fixture source so the committed snap.txt captures
both the lint and fmt failures.

Author: fengmk2

packages/cli/snap-tests/nested-oxc-config-proj-1/packages/proj-1/src/index.js

@@ -1,6 +1,6 @@
 function hello() {
   debugger;
-  return 'hello from proj-1';
+  return "hello from proj-1";
 }
 
 export { hello };

vite.config.ts

@@ -69,6 +69,7 @@ export default defineConfig({
       '**/tmp/**',
       'packages/cli/snap-tests/check-*/**',
       'packages/cli/snap-tests/fmt-ignore-patterns/src/ignored',
+      'packages/cli/snap-tests/nested-oxc-config-proj-1/**',
       'packages/cli/snap-tests-global/migration-lint-staged-ts-config',
       'docs/**',
       'ecosystem-ci/*/**',