chore(projects): use eslint flat config & update config

eslint.config.js

@@ -0,0 +1,15 @@
+import { defineConfig } from '@soybeanjs/eslint-config';
+
+export default defineConfig(
+  { vue: true },
+  {
+    rules: {
+      'vue/multi-word-component-names': [
+        'warn',
+        {
+          ignores: ['index', 'App', '[id]']
+        }
+      ]
+    }
+  }
+);