add bun backend and add upload bitstream component

src/views/UserView.vue

@@ -1,12 +1,18 @@
 <template>
-  <main>
-    <div class="w-full h-full">
+  <header>
+  </header>
+  <main class="relative">
+    <div class="fixed left-0 top-0 z-50">
       <Sidebar />
     </div>
+    <div class="w-screen h-screen flex items-center justify-center">
+      <UploadCard />
+    </div>
   </main>
 </template>
 
 <script setup lang="ts">
+import UploadCard from '@/components/UploadCard.vue';
 import Sidebar from '../components/Sidebar.vue'
 </script>