fix: 前端codex教程里模型ID升级为gpt-5.3-codex

frontend/src/components/keys/UseKeyModal.vue

@@ -493,7 +493,7 @@ function generateOpenAIFiles(baseUrl: string, apiKey: string): FileConfig[] {
 
   // config.toml content
   const configContent = `model_provider = "sub2api"
-model = "gpt-5.2-codex"
+model = "gpt-5.3-codex"
 model_reasoning_effort = "high"
 network_access = "enabled"
 disable_response_storage = true