重构项目结构，移除旧Java客户端，添加前后端目录

Co-authored-by: Cursor <cursoragent@cursor.com>

setup-aliyun-svn.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+set -e
+
+echo "===> 检查系统信息..."
+if [ -f /etc/os-release ]; then
+  . /etc/os-release
+else
+  echo "找不到 /etc/os-release，无法判断系统类型，退出。"
+  exit 1
+fi
+
+if [ "$ID" != "ubuntu" ]; then
+  echo "当前不是 Ubuntu（ID=$ID），本脚本按 Ubuntu + apt + 阿里云源编写，请自行确认后改造。"
+  exit 1
+fi
+
+CODENAME=$(lsb_release -cs 2>/dev/null || echo "$VERSION_CODENAME")
+if [ -z "$CODENAME" ]; then
+  echo "无法获取发行版代号（jammy/focal 等），退出。"
+  exit 1
+fi
+
+echo "===> 备份原 sources.list 到 /etc/apt/sources.list.bak ..."
+sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
+
+echo "===> 写入阿里云源 (Ubuntu $CODENAME) ..."
+sudo bash -c "cat >/etc/apt/sources.list <<EOF2
+deb http://mirrors.aliyun.com/ubuntu/ $CODENAME main restricted universe multiverse
+deb http://mirrors.aliyun.com/ubuntu/ $CODENAME-security main restricted universe multiverse
+deb http://mirrors.aliyun.com/ubuntu/ $CODENAME-updates main restricted universe multiverse
+deb http://mirrors.aliyun.com/ubuntu/ $CODENAME-backports main restricted universe multiverse
+
+deb-src http://mirrors.aliyun.com/ubuntu/ $CODENAME main restricted universe multiverse
+deb-src http://mirrors.aliyun.com/ubuntu/ $CODENAME-security main restricted universe multiverse
+deb-src http://mirrors.aliyun.com/ubuntu/ $CODENAME-updates main restricted universe multiverse
+deb-src http://mirrors.aliyun.com/ubuntu/ $CODENAME-backports main restricted universe multiverse
+EOF2"
+
+echo "===> apt 更新索引..."
+sudo apt update
+
+echo "===> 安装 subversion ..."
+sudo apt install -y subversion
+
+echo "===> 完成。当前 svn 版本："
+svn --version | head -n 1 || echo "svn 命令未找到，请检查安装是否成功。"