feat: file viewer

static/index.html.tpl

@@ -62,6 +62,22 @@
 
 <div class="toast" id="toast"></div>
 
+<!-- 文件预览弹窗 (CDN 资源经后端 /file-viewer/*filepath 缓存代理, 避免运行时 unpkg 依赖) -->
+<div class="preview-modal" id="previewModal" hidden>
+  <div class="preview-backdrop" id="previewBackdrop"></div>
+  <div class="preview-panel">
+    <div class="preview-header">
+      <span class="preview-title" id="previewTitle"></span>
+      <div class="preview-actions">
+        <a class="icon-btn" id="previewDownload" title="下载" download>↓</a>
+        <button class="icon-btn" id="previewClose" title="关闭" aria-label="关闭预览">✕</button>
+      </div>
+    </div>
+    <div class="preview-body" id="previewBody"></div>
+  </div>
+</div>
+
+<script src="/file-viewer/dist/flyfish-file-viewer-web-full.iife.js"></script>
 <script src="/static/app.js"></script>
 <script src="/static/helpers.js"></script>
 <script src="/static/batch.js"></script>