feat(03-02): /ai-model 页面接入 CredentialSlotDialog 组件

- 删除 L9-15 Dialog 系列命名导入（占位 Dialog 删后 page 不再直接使用 Dialog primitive）
- 新增 import { CredentialSlotDialog } from "@/components/ai-model/credential-slot-dialog"
- 删除 L473-485 占位 Dialog（含「对话框真实内容由 Phase 3 落地」字面量）
- 替换为 <CredentialSlotDialog open onOpenChange />，复用既有 isCredentialDialogOpen state
- 保留 mounted && hasPermission("credential-slot") 守卫 + Button 入口（Phase 2 已落地）
- CRED-FE-04 + CRED-FE-05 端到端串联，Milestone v1.0 收尾就绪

qy-lty-admin/app/ai-model/page.tsx

@@ -6,14 +6,8 @@ import { DashboardHeader } from "@/components/dashboard-header"
 import { Button } from "@/components/ui/button"
 import { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from "@/components/ui/card"
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs"
-import {
-  Dialog,
-  DialogContent,
-  DialogDescription,
-  DialogHeader,
-  DialogTitle,
-} from "@/components/ui/dialog"
 import { Brain, Mic, Database, Plus, Sparkles, Edit, Play, Sliders, User, KeyRound } from "lucide-react"
+import { CredentialSlotDialog } from "@/components/ai-model/credential-slot-dialog"
 import { hasPermission } from "@/lib/permissions"
 
 export default function AIModelPage() {
@@ -470,19 +464,10 @@ export default function AIModelPage() {
         </TabsContent>
       </Tabs>
 
-      <Dialog
+      <CredentialSlotDialog
         open={isCredentialDialogOpen}
         onOpenChange={setIsCredentialDialogOpen}
-      >
-        <DialogContent>
-          <DialogHeader>
-            <DialogTitle>通用凭据槽位</DialogTitle>
-            <DialogDescription>
-              对话框真实内容由 Phase 3 落地
-            </DialogDescription>
-          </DialogHeader>
-        </DialogContent>
-      </Dialog>
+      />
     </DashboardShell>
   )
 }