feat(dashboard): add administrator authentication

tests/test_dashboard_app.py

@@ -6,6 +6,7 @@ from streamlit.testing.v1 import AppTest
 sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 
 from dashboard.app import get_transfer_review_items
+from dashboard.authentication import ADMIN_ID_ENV, ADMIN_PASSWORD_ENV
 from scripts.ci_fixture_db import create_ci_fixture_db
 
 
@@ -43,6 +44,8 @@ def test_streamlit_apptest_core_pages_use_synthetic_fixture_db(tmp_path, monkeyp
     fixture = tmp_path / "fixture.sqlite3"
     create_ci_fixture_db(fixture)
     monkeypatch.setenv("JARCA_LEDGER_DB_PATH", str(fixture))
+    monkeypatch.setenv(ADMIN_ID_ENV, "test-admin")
+    monkeypatch.setenv(ADMIN_PASSWORD_ENV, "test-password")
 
     app_path = Path(__file__).resolve().parents[1] / "dashboard" / "app.py"
     page_expectations = {
@@ -58,6 +61,10 @@ def test_streamlit_apptest_core_pages_use_synthetic_fixture_db(tmp_path, monkeyp
         if page == "월정산":
             at.query_params["month"] = "2026-06"
         at.run()
+        at.text_input[0].input("test-admin")
+        at.text_input[1].input("test-password")
+        next(button for button in at.button if button.label == "로그인").click()
+        at.run()
         assert not at.exception
         body_text = "\n".join(str(item.value) for item in list(at.text) + list(at.markdown) + list(at.caption))
         assert expected_text in body_text