Update app.py

app.py

@@ -292,7 +292,19 @@ HTML_CONTENT = """<!DOCTYPE html>
     <div class="grid">
         <!-- 左侧：文件上传与浏览 -->
         <div class="card">
-            
+            <h2>📤 文件上传</h2>
+            <div class="upload-area">
+                <label for="fileInput" class="file-label" id="fileLabel">📎 选择文件</label>
+                <input type="file" id="fileInput">
+                <input type="text" id="uploadDir" class="dir-input" placeholder="目标目录 (可选，如 images/ 或 logs/2026/)" value="">
+                <button class="button" id="uploadBtn">⬆️ 上传到 Bucket</button>
+            </div>
+            <h2 style="margin-top: 2rem;">📁 浏览</h2>
+            <div class="nav-bar">
+                <input type="text" id="currentDir" class="dir-input" placeholder="当前目录 (留空为根目录)" value="">
+                <button class="button secondary small" id="listBtn">列出文件</button>
+                <button class="button secondary small" id="goUpBtn" title="返回上级">⬆️ 上级</button>
+            </div>
             <div id="fileList" class="file-list">
                 <div class="empty-message">加载中...</div>
             </div>