refactor: 弹框架构重构 + 审核规则seed API + LDAP默认配置 + 全量初始数据

弹框架构:
- Layout header/sidebar z-[200] 隔离弹框层，弹框不再遮挡面包屑
- dialog.tsx 简化: 去掉 border/backdrop-blur，统一暗色主题变量
- ModalOverlay z-[100] 对齐 Radix Dialog overlay 层级
- EditInstanceDialog 同步 z-index 修复
- 修复 InstanceGroupPage/InstancePage/LdapConfigPage 缺失 import
- 修复 InstanceGroupPage 缺失 X icon import
- RedisDetailPage ModalOverlay 迁移为 FormDialog

审核规则:
- POST /audit-rules/seed/:dbType 初始化默认规则 (mysql 11/pg 7/redis 4/mongo 4)
- POST /audit-rules/:id/toggle 开关规则
- PUT /audit-rules/:id 编辑规则
- seed.go 启动时自动创建 26 条默认审核规则

LDAP 默认配置:
- seed.go 自动写入 9 条 LDAP 配置 (8.217.205.92:389, dc=opsx,dc=vip)
- 全新 DB 启动即就位，无需手动配置

frontend/src/components/SqlEditor.tsx

@@ -1,4 +1,4 @@
-import React, { useRef, useEffect, useCallback, useImperativeHandle, forwardRef } from 'react';
+import { useRef, useEffect, useCallback, useImperativeHandle, forwardRef } from 'react';
 import { EditorState, Compartment } from '@codemirror/state';
 import type { Extension } from '@codemirror/state';
 import { EditorView, keymap, lineNumbers, placeholder as cmPlaceholder } from '@codemirror/view';
@@ -125,8 +125,8 @@ function getSQLExtension(language: SqlEditorProps['language'], schema?: SqlEdito
 
     const dialect = SQLDialect.define({
       keywords: 'select from where order by group having limit offset join inner left right full outer cross on and or not in is null like between as asc desc distinct all case when then else end exists union intersect except insert into values update set delete create alter drop table index view primary key foreign references unique check default grant revoke commit rollback begin transaction count sum avg min max show describe use database explain analyze',
-      schema: tables,
-    });
+      ...(tables ? { schema: tables } : {}),
+    } as any);
     return sql({ dialect });
   }