Why need to install jQuery in Vue ? Why i can not use jQuery using just import jquery.min.js file

I am learning Vue.js. So i did install vue.js in my system using vue cli. it installed successfully. now i am creating a website in vue.js. so i am templating of this static HTML to vue.js. so i am using jQuery and some other libraries and js files in this HTML. so when i am importing "jquery.min.js" form my src/assets/js" folder then its not compiling and running development server. it is stuck on 40% every time but when i am installing jquery and then import its compiling and starting development server. so my question is Why need to install jQuery and other node modules? Why we can not use them just using import from .js files. I am also sharing some screen shots so you will be understand better.

Thanks in advance for help.

main.js file

import Vue from 'vue';
import App from './App.vue';

import './assets/css/bootstrap.min.css';
import './assets/css/green-audio-player.css';
import './assets/css/icofont.css';
import './assets/css/jquery.calendar.css';
import './assets/css/swiper.min.css';
import './assets/css/main.css';
import './assets/js/jquery.min.js';
import './assets/js/bootstrap.min.js';
import './assets/js/green-audio-player.js';
import './assets/js/popper.min.js';
import './assets/js/swiper.min.js';


Vue.config.productionTip = false;

new Vue({
    render: h => h(App)
}).$mount('#app');