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_refresh_security.py

@@ -0,0 +1,47 @@
+from __future__ import annotations
+
+from tests.helpers import register_and_verify
+
+
+def _admin_headers(client) -> dict[str, str]:
+    from app.core.security import create_access_token
+    from app.modules.users.repository import get_user_by_email
+
+    admin = get_user_by_email("admin@compton.example")
+    token = create_access_token(admin.id, admin.role, admin.is_superuser)
+    return {"Authorization": f"Bearer {token}"}
+
+
+def test_refresh_fails_for_blocked_user(client):
+    register_and_verify(client, "blocked-refresh@example.com")
+    login = client.post(
+        "/api/v1/auth/login",
+        json={"email": "blocked-refresh@example.com", "password": "Valid123"},
+    )
+    assert login.status_code == 200
+    admin_headers = _admin_headers(client)
+    me = client.get(
+        "/api/v1/users/me",
+        headers={"Authorization": f"Bearer {login.json()['access_token']}"},
+    )
+    user_id = me.json()["user"]["id"]
+    blocked = client.patch(
+        f"/api/v1/admin/users/{user_id}",
+        headers=admin_headers,
+        json={"status": "blocked"},
+    )
+    assert blocked.status_code == 200
+    refresh = client.post("/api/v1/auth/refresh", headers={"Origin": "http://localhost:5173"})
+    assert refresh.status_code == 401
+
+
+def test_refresh_requires_origin_header_when_cookie_present(client):
+    register_and_verify(client, "origin-required@example.com")
+    login = client.post(
+        "/api/v1/auth/login",
+        json={"email": "origin-required@example.com", "password": "Valid123"},
+    )
+    assert login.status_code == 200
+    response = client.post("/api/v1/auth/refresh")
+    assert response.status_code == 403
+    assert response.json()["detail"] == "INVALID_ORIGIN"