refactor(api): 重命名axios实例变量以提高可读性

src/api/axios.ts

@@ -19,7 +19,7 @@ export interface MyRequestInstance extends Axios {
   <T = any>(config: AxiosRequestConfig): Promise<MyResponseType<T>>
 }
 
-const a = axios.create({
+const axiosInstance = axios.create({
   baseURL: `${import.meta.env.PROD ? import.meta.env.VITE_PRO_PATH : ''}${axiosPre}`,
   timeout: ResultEnum.TIMEOUT
 }) as unknown as MyRequestInstance