test(migrate): show generated vite.config.ts in plugins-cleanup snap

So reviewers can see the lint/staged/fmt block the comprehensive cleanup
produces, not just the trimmed package.json.

Author: fengmk2

packages/cli/snap-tests-global/migration-eslint-plugins-cleanup/snap.txt

@@ -26,4 +26,41 @@
   "packageManager": "pnpm@<semver>"
 }
 
-> test ! -f eslint.config.mjs # check eslint config is removed
+> test ! -f eslint.config.mjs # check eslint config is removed
+> cat vite.config.ts # verify the generated vite.config.ts
+import { defineConfig } from 'vite-plus';
+
+export default defineConfig({
+  staged: {
+    "*": "vp check --fix"
+  },
+  fmt: {},
+  lint: {
+    "plugins": [
+      "oxc",
+      "typescript",
+      "unicorn",
+      "react"
+    ],
+    "categories": {
+      "correctness": "warn"
+    },
+    "env": {
+      "builtin": true
+    },
+    "rules": {
+      "no-unused-vars": "error",
+      "vite-plus/prefer-vite-plus-imports": "error"
+    },
+    "options": {
+      "typeAware": true,
+      "typeCheck": true
+    },
+    "jsPlugins": [
+      {
+        "name": "vite-plus",
+        "specifier": "vite-plus/oxlint-plugin"
+      }
+    ]
+  },
+});

packages/cli/snap-tests-global/migration-eslint-plugins-cleanup/steps.json

@@ -2,6 +2,7 @@
   "commands": [
     "vp migrate --no-interactive # migration should remove ESLint, plugins, configs, scopes, formatters, and peer eslint",
     "cat package.json # verify the comprehensive ESLint ecosystem cleanup",
-    "test ! -f eslint.config.mjs # check eslint config is removed"
+    "test ! -f eslint.config.mjs # check eslint config is removed",
+    "cat vite.config.ts # verify the generated vite.config.ts"
   ]
 }