add bun backend and add upload bitstream component

src/components/UploadCard.vue

@@ -0,0 +1,52 @@
+<template>
+  <div class="card card-dash shadow-xl w-90 h-60">
+    <div class="card-body flex">
+
+      <!-- Title -->
+      <h1 class="card-title place-self-center font-bold text-2xl">上传比特流文件</h1>
+
+      <!-- Input File -->
+      <fieldset class="fieldset w-full">
+        <legend class="fieldset-legend text-sm">选择或拖拽上传文件</legend>
+        <input type="file" class="file-input" @change="handleFileChange" />
+        <label class="fieldset-label">Max size 2MB</label>
+      </fieldset>
+
+      <!-- Upload Button -->
+      <div class="card-actions">
+        <button @click="uploadBitStream" class="btn btn-primary grow">上传</button>
+      </div>
+
+    </div>
+  </div>
+</template>
+
+<script lang="ts" setup>
+var bitstream = null;
+
+function handleFileChange(event: Event): void {
+  const target = event.target as HTMLInputElement;
+  const file = target.files?.[0]; // 获取选中的第一个文件
+
+  if (!file) {
+    console.error('未选择文件');
+    return;
+  }
+
+  bitstream = file;
+
+  console.log(bitstream);
+}
+
+function uploadBitStream() {
+
+}
+
+function checkFileType(file: File) {
+
+}
+</script>
+
+<style scoped lang="postcss">
+@import "../assets/main.css";
+</style>