deb: postinst 自动安装系统依赖 (aria2 + p7zip-full), control Depends 加 aria2

debian/control

@@ -7,7 +7,7 @@ Standards-Version: 4.6.2
 
 Package: 7z-encrypt-client
 Architecture: all
-Depends: python3 (>= 3.10), python3-venv, p7zip-full
+Depends: python3 (>= 3.10), python3-venv, p7zip-full, aria2
 Description: 端到端加密文件传输客户端 (源码版, 手机/Termux 用)
  零知识 + 零合并的文件安全传输客户端:
  7z 压缩 -> cobblestone 加密 -> 分卷上传; 下载逐卷拉取本地解密。
@@ -18,7 +18,7 @@ Description: 端到端加密文件传输客户端 (源码版, 手机/Termux 用)
 
 Package: 7z-encrypt-client-bin
 Architecture: amd64
-Depends: p7zip-full
+Depends: p7zip-full, aria2
 Conflicts: 7z-encrypt-client
 Replaces: 7z-encrypt-client
 Description: 端到端加密文件传输客户端 (x86_64 原生编译版)

debian/postinst

@@ -3,6 +3,8 @@ set -e
 
 case "$1" in
     configure)
+        echo "正在安装系统依赖 (aria2 + p7zip-full) ..."
+        apt-get install -y aria2 p7zip-full >/dev/null 2>&1 || true
         P=/usr/share/7z-encrypt/.venv
         if [ ! -x "$P/bin/python" ]; then
             echo "正在创建 7z-encrypt 运行环境 (venv + cryptography/tqdm) ..."