feat(app_zen_box): 初始化安卓端项目配置，完善资源与构建流程

1.  添加安卓端启动图标、启动页资源与配置文件
2.  更新API接口地址为正式服务器地址
3.  调整package.json脚本与依赖项
4.  完善安卓项目构建配置与原生代码
5.  修复剪贴板下载按钮逻辑，改为流式下载

public/tools/private_clipboard/clipboard.js

@@ -553,15 +553,30 @@ const buildItemCard = (item) => {
           const url = new URL(fileItem.file_url, window.location.origin).href
           copyTextToClipboard(url)
         }
-        const download = document.createElement('a')
-        download.className = 'btn'
-        download.href = fileItem.file_url
-        download.download = fileItem.file_name || ''
-        download.textContent = '下载'
+        const downloadBtn = document.createElement('button')
+        downloadBtn.className = 'btn'
+        downloadBtn.textContent = '下载'
+        downloadBtn.addEventListener('click', async () => {
+          try {
+            const res = await fetch(fileItem.file_url)
+            if (!res.ok) throw new Error(`HTTP ${res.status}`)
+            const blob = await res.blob()
+            const url = URL.createObjectURL(blob)
+            const a = document.createElement('a')
+            a.href = url
+            a.download = fileItem.file_name || 'file'
+            document.body.appendChild(a)
+            a.click()
+            document.body.removeChild(a)
+            setTimeout(() => URL.revokeObjectURL(url), 5000)
+          } catch (e) {
+            setStatus(`下载失败: ${String(e.message || e)}`, 'error')
+          }
+        })
         row.appendChild(name)
         row.appendChild(metaText)
         row.appendChild(copyUrlBtn)
-        row.appendChild(download)
+        row.appendChild(downloadBtn)
         card.appendChild(row)
       })
     }