feat(02-01): /ai-model 页面新增凭据槽位入口 Button + 占位 Dialog

- 文件转为 Client Component（line 1 加 'use client'）
- 新增 import：useState/useEffect (react)、Dialog 子组件 5 个、KeyRound (lucide-react)、hasPermission (@/lib/permissions)
- 函数体顶部加 mounted 守卫 + isCredentialDialogOpen 两个 useState（复用 sidebar.tsx 同模式避免 SSR 水合警告）
- DashboardHeader children 改为 flex 容器，包含原「添加新模型」+ 新增「凭据槽位」(variant=outline)
- 凭据槽位 Button 由 mounted && hasPermission('credential-slot') 收敛，未授权角色 DOM 中完全不存在
- </Tabs> 之后插入 controlled mode 占位 Dialog，DialogTitle「通用凭据槽位」+ DialogDescription 提示由 Phase 3 落地
- Tabs / TabsContent / Card 等所有原有内容（line 18-441）逐字未动

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

@@ -1,18 +1,47 @@
+"use client"
+
+import { useState, useEffect } from "react"
 import { DashboardShell } from "@/components/dashboard-shell"
 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 { Brain, Mic, Database, Plus, Sparkles, Edit, Play, Sliders, User } from "lucide-react"
+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 { hasPermission } from "@/lib/permissions"
 
 export default function AIModelPage() {
+  const [mounted, setMounted] = useState(false)
+  const [isCredentialDialogOpen, setIsCredentialDialogOpen] = useState(false)
+
+  useEffect(() => {
+    setMounted(true)
+  }, [])
+
   return (
     <DashboardShell>
       <DashboardHeader heading="大模型管理" text="管理洛天依的AI模型、语音和知识库">
+        <div className="flex items-center gap-2">
           <Button className="bg-gradient-to-r from-pink-500 to-purple-600 hover:from-pink-600 hover:to-purple-700 transition-all duration-300 shadow-md hover:shadow-lg">
             <Plus className="mr-2 h-4 w-4" />
             添加新模型
           </Button>
+          {mounted && hasPermission("credential-slot") && (
+            <Button
+              variant="outline"
+              onClick={() => setIsCredentialDialogOpen(true)}
+            >
+              <KeyRound className="mr-2 h-4 w-4" />
+              凭据槽位
+            </Button>
+          )}
+        </div>
       </DashboardHeader>
 
       <Tabs defaultValue="framework" className="space-y-4">
@@ -440,6 +469,20 @@ export default function AIModelPage() {
           </Card>
         </TabsContent>
       </Tabs>
+
+      <Dialog
+        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>
   )
 }