feat: 新增 Account 和 Script 页面

- 添加 Account 账户页面
- 添加 Script 脚本页面
- 优化侧边栏，添加知识库数量显示

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/views/Script.vue

@@ -0,0 +1,15 @@
+<script setup lang="ts">
+// Script 页面 - 占位
+</script>
+
+<template>
+  <div class="p-6 min-h-screen">
+    <div class="flex items-center gap-2 mb-6">
+      <i class="fa-solid fa-code text-gray-400"></i>
+      <span class="font-medium">Script</span>
+    </div>
+    <div class="text-gray-400">
+      Script management coming soon...
+    </div>
+  </div>
+</template>