fix: 移除所有弹框遮罩层点击关闭 — 防止输入时误触关闭

涉及文件 (12处):
- InstancePage.tsx: 添加数据源弹框
- UsersPage.tsx: 新建/编辑/重置密码/详情弹框 (4处)
- RolesPage.tsx: 克隆角色弹框
- InstanceGroupPage.tsx: 新建/编辑/关联实例/关联用户弹框 (4处)
- SlowQueryPage.tsx: 查询对比弹框
- RedisDetailPage.tsx: 键详情/新增键弹框 (2处)

改动: 遮罩层div移除onClick，只能通过X按钮或取消按钮关闭

frontend/src/pages/RedisDetailPage.tsx

@@ -246,7 +246,7 @@ export default function RedisDetailPage() {
 
       {/* 键详情弹窗 */}
       {selectedKey && (
-        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50" onClick={function () { setSelectedKey(null); }}>
+        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50">
           <div className="bg-[var(--dg-bg-secondary)] rounded-xl shadow-2xl w-full max-w-lg max-h-[70vh] overflow-y-auto p-6" onClick={function (e) { e.stopPropagation(); }}>
             <div className="flex items-center justify-between mb-4">
               <h3 className="font-semibold">键详情</h3>
@@ -268,7 +268,7 @@ export default function RedisDetailPage() {
 
       {/* 新增键弹窗 */}
       {showAddKey && (
-        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50" onClick={function () { setShowAddKey(false); }}>
+        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50">
           <div className="bg-[var(--dg-bg-secondary)] rounded-xl shadow-2xl w-full max-w-md p-6" onClick={function (e) { e.stopPropagation(); }}>
             <div className="flex items-center justify-between mb-4">
               <h3 className="font-semibold">新增键</h3>