feat: ZRANGE WITHSCORES JSON自动解析为结构化表格 + Redis审计规则 + 前端安全检查

- ZRANGE WITHSCORES 自动检测JSON member，展开为 open/close/high/low/volume 等独立列
- Redis 审计: 只读命令安全，写命令warning，FLUSHALL等危险命令error
- TicketCreatePage: auditResult.findings 添加 undefined 安全检查
- 审计API支持 instance_id 自动解析 db_type

frontend/src/pages/TicketCreatePage.tsx

@@ -399,7 +399,7 @@ export default function TicketCreatePage() {
                     <span className="text-green-400 font-medium flex items-center gap-1"><Check className="w-3.5 h-3.5" /> 通过</span>
                   )}
                 </div>
-                {auditResult.findings.length > 0 && (
+                {auditResult.findings && auditResult.findings.length > 0 && (
                   <div className="space-y-1.5">
                     {auditResult.findings.map((f, idx) => (
                       <div key={idx} className={'flex items-center gap-2 px-3 py-2 rounded-lg text-xs ' + (LEVEL_COLOR[f.level] || '')}>