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_auth_router.py

@@ -0,0 +1,42 @@
+from tests.helpers import latest_token, register_and_verify
+
+
+def test_health(client):
+    response = client.get("/api/v1/health")
+    assert response.status_code == 200
+    assert response.json()["status"] == "ok"
+
+
+def test_register_and_verify_and_login(client):
+    register_response = client.post(
+        "/api/v1/auth/register",
+        json={"email": "user@example.com", "password": "Valid123"},
+    )
+    assert register_response.status_code == 200
+    assert "user_id" not in register_response.json()
+
+    duplicate = client.post(
+        "/api/v1/auth/register",
+        json={"email": "user@example.com", "password": "Valid123"},
+    )
+    assert duplicate.status_code == 200
+    assert "user_id" not in duplicate.json()
+
+    verify_response = client.post(
+        "/api/v1/auth/verify-email",
+        json={"token": latest_token("user@example.com", "verify_email")},
+    )
+    assert verify_response.status_code == 200
+
+    login_response = client.post(
+        "/api/v1/auth/login",
+        json={"email": "user@example.com", "password": "Valid123"},
+    )
+    assert login_response.status_code == 200
+    assert "access_token" in login_response.json()
+
+
+def test_forgot_password_anti_enumeration(client):
+    response = client.post("/api/v1/auth/forgot-password", json={"email": "missing@example.com"})
+    assert response.status_code == 200
+    assert "If email is registered" in response.json()["message"]