✨ feat: add gpt-4o-mini in OpenAI Provider and set it as the default model (#3256)

* ✨ feat: gpt-4o-mini to openai provider

* ♻️ refactor: move gpt-4o-mini as default model

* ✅ test: fix test

* 🐛 fix: set gpt-4o-mini as default model

* chore: improve code

* chore: improve code

---------

Co-authored-by: arvinxx <arvinx@foxmail.com>

.seorc.cjs

@@ -2,7 +2,7 @@ const { defineConfig } = require('@lobehub/seo-cli');
 
 module.exports = defineConfig({
   entry: ['./docs/**/*.mdx'],
-  modelName: 'gpt-3.5-turbo-0125',
+  modelName: 'gpt-4o-mini',
   experimental: {
     jsonMode: true,
   },