Follow the Provider & Models heading rename in the activation journey

The license-activation journey (env-gated, skipped without activation
credentials) still asserted the retired Assistant & Patrol heading on
/settings/system-ai; the panel renders Provider & Models now, per
settingsHeaderMeta. Copy-only alignment; the journey itself still needs
a live activation environment to run.

tests/integration/tests/10-v6-license-activation.spec.ts

@@ -272,7 +272,7 @@ test.describe.serial("V6 license activation flow", () => {
 
     await page.goto("/settings/system-ai");
     await expect(
-      page.getByRole("heading", { name: "Assistant & Patrol" }).first(),
+      page.getByRole("heading", { name: "Provider & Models" }).first(),
     ).toBeVisible();
 
     const preSettingsRes = await apiRequest(page, "/api/settings/ai");