Fix Qwen OAuth and Ollama models listing

- Add generateUXDesignerPrompt method to QwenOAuthService
- Fix Ollama Cloud listModels to handle multiple response formats
- Improve Ollama models parsing with array/different response structures
- All providers now support UX Designer Prompt feature

app/api/qwen/oauth/refresh/route.ts

@@ -0,0 +1,45 @@
+import { NextRequest, NextResponse } from "next/server";
+import { QWEN_OAUTH_CLIENT_ID, QWEN_OAUTH_TOKEN_ENDPOINT } from "../../constants";
+
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json().catch(() => ({}));
+    const { refresh_token } = body || {};
+
+    if (!refresh_token) {
+      return NextResponse.json(
+        { error: "refresh_token is required" },
+        { status: 400 }
+      );
+    }
+
+    const response = await fetch(QWEN_OAUTH_TOKEN_ENDPOINT, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/x-www-form-urlencoded",
+        Accept: "application/json",
+      },
+      body: new URLSearchParams({
+        grant_type: "refresh_token",
+        refresh_token,
+        client_id: QWEN_OAUTH_CLIENT_ID,
+      }),
+    });
+
+    const payload = await response.text();
+    if (!response.ok) {
+      return NextResponse.json(
+        { error: "Token refresh failed", details: payload },
+        { status: response.status }
+      );
+    }
+
+    return NextResponse.json(JSON.parse(payload));
+  } catch (error) {
+    console.error("Qwen token refresh failed", error);
+    return NextResponse.json(
+      { error: "Token refresh failed" },
+      { status: 500 }
+    );
+  }
+}