Add duplicate functionality for assistants and credentials

Implement server-side duplication for both assistants and credentials, allowing users to create copies with unique IDs and modified names. Update the respective API routes and frontend components to handle duplication requests, ensuring sensitive information is securely managed. Enhance the AssistantPage and ComponentsModelsPage to support this new feature, including loading and error handling for the duplication process.

frontend/src/components/pages/ComponentsModelsPage.tsx

@@ -5,6 +5,7 @@ import {
   CheckCircle2,
   ChevronLeft,
   ChevronRight,
+  Copy,
   Eye,
   EyeOff,
   HelpCircle,
@@ -109,6 +110,7 @@ export function ComponentsModelsPage() {
   const [saving, setSaving] = useState(false);
   const [saveError, setSaveError] = useState<string | null>(null);
   const [deletingId, setDeletingId] = useState<string | null>(null);
+  const [duplicatingId, setDuplicatingId] = useState<string | null>(null);
 
   const [testing, setTesting] = useState(false);
   const [testResult, setTestResult] = useState<"idle" | "ok" | "fail">("idle");
@@ -233,6 +235,19 @@ export function ComponentsModelsPage() {
     }
   }
 
+  // 服务端整行复制(含真 key,密钥不经浏览器)
+  async function handleDuplicate(id: string) {
+    setDuplicatingId(id);
+    try {
+      await credentialsApi.duplicate(id);
+      await loadModels();
+    } catch (error) {
+      setLoadError(error instanceof Error ? error.message : "复制失败");
+    } finally {
+      setDuplicatingId(null);
+    }
+  }
+
   const filteredModels = models.filter((model) => {
     if (typeFilter !== "全部" && model.type !== typeFilter) {
       return false;
@@ -404,6 +419,21 @@ export function ComponentsModelsPage() {
                       align="end"
                       className="w-32 min-w-32 rounded-xl border border-hairline bg-popover p-1"
                     >
+                      <DropdownMenuItem
+                        className="rounded-lg"
+                        disabled={duplicatingId === model.id}
+                        onSelect={(event) => {
+                          event.preventDefault();
+                          void handleDuplicate(model.id);
+                        }}
+                      >
+                        {duplicatingId === model.id ? (
+                          <Loader2 size={14} className="animate-spin" />
+                        ) : (
+                          <Copy size={14} />
+                        )}
+                        复制
+                      </DropdownMenuItem>
                       <DropdownMenuItem
                         variant="destructive"
                         className="rounded-lg"