fix(zram): 优化 zram 设备检测与内存计算逻辑

1.sh

@@ -291,8 +291,23 @@ install_zram() {
     print_yellow "未找到 modprobe，继续尝试配置 zram-tools"
   fi
 
+  if command -v udevadm >/dev/null 2>&1; then
+    udevadm settle || true
+  fi
+
+  if [ ! -d /sys/block/zram0 ] || [ ! -b /dev/zram0 ]; then
+    print_yellow "未检测到可用的 zram0 设备，跳过 zram 配置"
+    return 0
+  fi
+
   local total_mem algo percent
-  total_mem=$(free -m | awk '/^Mem:/{print $2}')
+  total_mem=$(awk '/MemTotal/{print int($2 / 1024)}' /proc/meminfo)
+
+  if ! [[ "$total_mem" =~ ^[0-9]+$ ]] || [ "$total_mem" -le 0 ]; then
+    print_yellow "无法准确检测总内存，跳过 zram 配置"
+    return 0
+  fi
+
   echo "检测到总内存: ${total_mem}MB"
 
   if [ "$total_mem" -le 2500 ]; then