add litegraph test config (#5310)

* add litegraph test config

* remove unnecessary setup file

* exclude litegraph test config

* add npm script

vitest.litegraph.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  plugins: [],
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    include: ['src/lib/litegraph/test/**/*.test.ts']
+  },
+  resolve: {
+    alias: {
+      '@': '/src'
+    }
+  },
+  define: {
+    __USE_PROD_CONFIG__: false
+  }
+})