fix(grokbuild): use preset apiKeyUrl for the get-API-key link

The Grok Build form passed the preset's websiteUrl to the API key link,
so sponsor presets opened the plain homepage instead of their referral
signup URL. Prefer the selected preset's apiKeyUrl, matching
useApiKeyLink, without changing the saved websiteUrl.

src/components/providers/forms/GrokBuildProviderForm.tsx

@@ -196,6 +196,10 @@ export function GrokBuildProviderForm({
   });
   const { isSubmitting } = form.formState;
   const websiteUrl = form.watch("websiteUrl") ?? "";
+  // 「获取 API Key」优先用预设的 apiKeyUrl（带推广参数），与 useApiKeyLink 一致
+  const apiKeyLinkUrl =
+    grokPresetEntries.find((entry) => entry.id === selectedPresetId)?.preset
+      .apiKeyUrl || websiteUrl;
 
   useEffect(() => {
     onSubmittingChange?.(isSubmitting);
@@ -471,8 +475,8 @@ export function GrokBuildProviderForm({
                 syncStructuredConfig({ apiKey: value });
               }}
               category={category}
-              shouldShowApiKeyLink={Boolean(websiteUrl)}
-              websiteUrl={websiteUrl}
+              shouldShowApiKeyLink={Boolean(apiKeyLinkUrl)}
+              websiteUrl={apiKeyLinkUrl}
               isPartner={isPartner}
               partnerPromotionKey={partnerPromotionKey}
               shouldShowSpeedTest

tests/components/GrokBuildProviderForm.test.tsx

@@ -46,6 +46,28 @@ describe("GrokBuildProviderForm", () => {
     expect(nameInput?.value).toBe("PatewayAI");
   });
 
+  it("points the get-API-key link at the preset's apiKeyUrl", async () => {
+    const user = userEvent.setup();
+    const { container } = render(
+      <GrokBuildProviderForm
+        submitLabel="Save"
+        onSubmit={() => {}}
+        onCancel={() => {}}
+      />,
+    );
+
+    await user.click(screen.getByRole("button", { name: /88API/ }));
+
+    const websiteInput = container.querySelector<HTMLInputElement>(
+      'input[name="websiteUrl"]',
+    );
+    expect(websiteInput?.value).toBe("https://88api.ai");
+    expect(screen.getByRole("link", { name: /API Key/ })).toHaveAttribute(
+      "href",
+      "https://88api.ai/sign-up?aff=HSGY",
+    );
+  });
+
   it("submits a complete config.toml payload with Grok defaults", async () => {
     const user = userEvent.setup();
     const onSubmit = vi.fn();