Here's the commit message following conventional commit format:

```
chore(webpack): re-enable CleanWebpackPlugin and remove notion test file

This commit:
1. Re-enables CleanWebpackPlugin in the webpack configuration which was previously commented out
2. Removes the unused notion/service.test.ts file since it's no longer needed
3. Uncomments the distFiles declaration that's used by CleanWebpackPlugin

The changes clean up the build process by properly cleaning the dist directory between builds and removing test code for functionality that's no longer used.
```

Author: DiamondYuan

src/common/backend/services/notion/service.test.ts

@@ -12,7 +12,7 @@ function resolve(dir) {
   return path.join(__dirname, '..', dir);
 }
 
-// const distFiles = fs.readdirSync(resolve('dist')).filter((o) => o !== '.gitkeep');
+const distFiles = fs.readdirSync(resolve('dist')).filter((o) => o !== '.gitkeep');
 
 module.exports = {
   entry: {
@@ -149,13 +149,13 @@ module.exports = {
       $: 'jquery',
       jQuery: 'jquery',
     }),
-    // new CleanWebpackPlugin(
-    //   distFiles.map((p) => `dist/${p}`),
-    //   {
-    //     root: path.resolve(__dirname, '../'),
-    //     verbose: true,
-    //   }
-    // ),
+    new CleanWebpackPlugin(
+      distFiles.map((p) => `dist/${p}`),
+      {
+        root: path.resolve(__dirname, '../'),
+        verbose: true,
+      }
+    ),
     new CopyWebpackPlugin([
       {
         from: resolve('chrome/html'),