Add Vue user H5 client

ai_knowledge_base_v2/apps/user-client/src/components/ChatMessage.vue

@@ -0,0 +1,17 @@
+<script setup lang="ts">
+defineProps<{
+  role: "user" | "assistant";
+  content: string;
+  streaming?: boolean;
+}>();
+</script>
+
+<template>
+  <article class="message" :class="role">
+    <div class="avatar">{{ role === "assistant" ? "AI" : "我" }}</div>
+    <div class="bubble">
+      <div class="content">{{ content }}</div>
+      <span v-if="streaming" class="typing">正在生成</span>
+    </div>
+  </article>
+</template>