build: remove type module from package.json

To generate UMD CJS by default with .js extension (for CDN link)
and ESM with .mjs extension (for bundlers)

tsconfig.node.json

@@ -6,5 +6,5 @@
     "resolveJsonModule": true,
     "allowSyntheticDefaultImports": true
   },
-  "include": ["vite.config.ts"]
+  "include": ["vite.config.mts"]
 }