feat: _empty_state — current_stage + topics 키 추가

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/e2e.py

@@ -9,7 +9,11 @@ import shutil
 
 # 격리 데이터 파일 (실제 hackathon.json과 분리)
 TEST_DATA = tempfile.mktemp(suffix=".json")
-shutil.copy("/app/hackathon.json", TEST_DATA)
+SEED_CANDIDATES = ["/app/data/hackathon.json", "/app/hackathon.json"]
+seed = next((p for p in SEED_CANDIDATES if os.path.exists(p)), None)
+if seed is None:
+    raise SystemExit(f"seed 파일 없음: {SEED_CANDIDATES}")
+shutil.copy(seed, TEST_DATA)
 os.environ["DATA_PATH"] = TEST_DATA
 os.environ["ADMIN_TOKEN"] = "test"
 
@@ -198,6 +202,29 @@ def t_vote_count():
     assert len(list_votes()) == 0
 
 
+def t_empty_state_has_topics_and_stage():
+    from app import _empty_state
+    s = _empty_state()
+    assert s["settings"]["current_stage"] == "intro"
+    assert s["topics"] == {"categories": []}
+
+
+def t_load_data_backfills_nested_settings():
+    """기존 settings에 voting_open만 있을 때 current_stage 자동 보강."""
+    legacy = {
+        "people": [],
+        "settings": {"voting_open": True},
+        "titles": {},
+        "tie_breaks": {},
+        "votes": [],
+    }
+    save_data(legacy)
+    fresh = load_data()
+    assert fresh["settings"]["voting_open"] is True
+    assert fresh["settings"]["current_stage"] == "intro"
+    assert fresh["topics"] == {"categories": []}
+
+
 if __name__ == "__main__":
     print(f"# E2E (data={TEST_DATA})\n")
     test("hackathon.json 로드 (34명, 7팀)", t_load)
@@ -212,6 +239,8 @@ if __name__ == "__main__":
     test("archive 동률 skip", t_archive_skip_pending)
     test("atomic write", t_atomic_write)
     test("clear_votes", t_vote_count)
+    test("empty_state 신규 키", t_empty_state_has_topics_and_stage)
+    test("load_data nested 키 backfill", t_load_data_backfills_nested_settings)
 
     fails = sum(1 for r, _ in results if r == FAIL)
     print(f"\n# {len(results)} 중 통과 {len(results) - fails}, 실패 {fails}")