Update admin theme/layout and refresh README details.

Align the project baseline with the latest admin interface styling and layout structure while documenting setup and usage updates in README.

apps/api/tests/modules/auth/test_lockout.py

@@ -0,0 +1,19 @@
+from tests.helpers import latest_token, register_and_verify
+
+
+def test_auth_brute_force_lockout(client):
+    register_and_verify(client, "locked@example.com")
+
+    for _ in range(5):
+        response = client.post(
+            "/api/v1/auth/login",
+            json={"email": "locked@example.com", "password": "WrongPass1"},
+        )
+        assert response.status_code == 401
+
+    locked = client.post(
+        "/api/v1/auth/login",
+        json={"email": "locked@example.com", "password": "Valid123"},
+    )
+    assert locked.status_code == 429
+    assert locked.json()["detail"] == "ACCOUNT_TEMPORARILY_LOCKED"