简化 CI 配置：统一使用 stable Debian 发行版

- 移除多发行版 Debian Package Registry 上传（bookworm、trixie）
- 统一上传到 stable 发行版池，简化维护和用户体验
- 更新 README 和文档系统的安装指南
- 新增 CI 工作流程概述文档
- 保持 ubuntu 和 alpine 双发行版构建支持

debian/postrm

@@ -5,10 +5,11 @@ case "$1" in
     purge)
         # Remove user and group
         if getent passwd p2pool >/dev/null; then
-            deluser --system p2pool 2>/dev/null || true
+            deluser --quiet p2pool || true
         fi
+
         if getent group p2pool >/dev/null; then
-            delgroup --system p2pool 2>/dev/null || true
+            delgroup --quiet p2pool || true
         fi
 
         # Remove data directories (only on purge)

debian/prerm

@@ -1,10 +1,17 @@
 #!/bin/sh
 set -e
 
-# Stop service if running
-if [ -d /run/systemd/system ] && systemctl is-active --quiet p2pool.service; then
-    echo "Stopping P2Pool service..."
-    systemctl stop p2pool.service
+# Stop and disable service if running
+if [ -d /run/systemd/system ]; then
+    if systemctl is-active --quiet p2pool.service; then
+        echo "Stopping p2pool service..."
+        systemctl stop p2pool.service
+    fi
+
+    if systemctl is-enabled --quiet p2pool.service 2>/dev/null; then
+        echo "Disabling p2pool service..."
+        systemctl disable p2pool.service
+    fi
 fi
 
 exit 0