refactor: 统一替换多脚本公共库加载逻辑

移除公共库文件存在检查，直接删除旧文件后重新下载，确保始终使用最新版本公共库
同时修复mt3600.sh中的多余空行和缩进格式问题

mt3600.sh

@@ -7,12 +7,11 @@ LIB_COMMON="/tmp/lib-common.sh"
 
 # 下载并加载公共库
 load_common_lib() {
-    if [ ! -f "$LIB_COMMON" ]; then
-        wget -O "$LIB_COMMON" "$HTTP_HOST/lib/lib-common.sh" 2>/dev/null || {
-            echo "下载公共库失败"
-            exit 1
-        }
-    fi
+    rm -f "$LIB_COMMON"
+    wget -O "$LIB_COMMON" "$HTTP_HOST/lib/lib-common.sh" 2>/dev/null || {
+        echo "下载公共库失败"
+        exit 1
+    }
     . "$LIB_COMMON"
 }
 
@@ -50,16 +49,16 @@ do_quickstart() {
 do_install_ui_helper_silent() {
     local ipk_file="/tmp/glinjector_3.0.5-6_all.ipk"
     local sha_file="${ipk_file}.sha256"
-
+    
     wget -O "$sha_file" "$HTTP_HOST/ui/glinjector_3.0.5-6_all.ipk.sha256" || return 1
     wget --user-agent="Mozilla/5.0" -O "$ipk_file" "$HTTP_HOST/ui/glinjector_3.0.5-6_all.ipk" || return 1
-
+    
     cd "$(dirname "$ipk_file")"
     sha256sum -c "$sha_file" || {
         rm -f "$ipk_file"
         return 1
     }
-
+    
     opkg update
     opkg install "$ipk_file"
 }
@@ -97,7 +96,7 @@ while true; do
     echo "*******支持的机型列表***************************************************"
     green "*******GL-iNet MT3600BE********"
     echo
-
+    
     light_magenta " 1. $result"
     echo
     light_magenta " 2. 安装argon紫色主题"
@@ -117,40 +116,40 @@ while true; do
     echo " Q. 退出本程序"
     echo
     read -p "请选择一个选项: " choice
-
+    
     case $choice in
-    1)
-        run_quick_install
+        1)
+            run_quick_install
         ;;
-    2)
-        do_install_argon_skin
+        2)
+            do_install_argon_skin
         ;;
-    3)
-        do_istore
+        3)
+            do_istore
         ;;
-    4)
-        hide_ui_elements
+        4)
+            hide_ui_elements
         ;;
-    5)
-        set_glfan_temp
+        5)
+            set_glfan_temp
         ;;
-    6)
-        do_install_ui_helper
+        6)
+            do_install_ui_helper
         ;;
-    7)
-        advanced_uninstall
+        7)
+            advanced_uninstall
         ;;
-    8)
-        recovery
+        8)
+            recovery
         ;;
-    q | Q)
-        echo "退出"
-        exit 0
+        q | Q)
+            echo "退出"
+            exit 0
         ;;
-    *)
-        echo "无效选项，请重新选择。"
+        *)
+            echo "无效选项，请重新选择。"
         ;;
     esac
-
+    
     read -p "按 Enter 键继续..."
 done