fix(security): retire default-credential surface (yanxue-20260914-cma-defaultcred-code-fix)

- Login.vue: no prefilled default creds; no anonymous entity enumeration on mount

- deploy.sh: readiness polling (0.5s/30s cap) replaces fixed sleep 3; login smoke reads same-source 600 secret file, missing file = explicit abort

- 19 verify/check/gen_report scripts: shared _admin_creds() loader (CMA_ADMIN_ENV -> ops .secrets -> profile copy); no hardcoded creds

- tests: single TEST_USER_PASSWORD fixture constant; docs: pointer to 600 secret file; removed 4 legacy .bak + pycache residue

backend/tests/test_predict.py

@@ -14,7 +14,7 @@ from fastapi.testclient import TestClient
 from sqlalchemy.orm import Session
 
 from app.models import CashForecast, ForecastAccuracy, Entity, User, UserEntity
-from tests.conftest import create_test_user, get_token_for_user, auth_header
+from tests.conftest import create_test_user, get_token_for_user, auth_header, TEST_USER_PASSWORD
 
 BASE = "/api/cma/predict"
 
@@ -35,7 +35,7 @@ def _token_for_entity(client: TestClient, db: Session, eid: int) -> str:
         db.add(UserEntity(user_id=user.id, entity_id=eid))
         db.commit()
     resp = client.post("/api/cma/auth/login", json={
-        "username": "testadmin", "password": "admin123", "entity_id": eid})
+        "username": "testadmin", "password": TEST_USER_PASSWORD, "entity_id": eid})
     assert resp.status_code == 200, f"登录 entity{eid} 失败: {resp.text[:200]}"
     return resp.json()["token"]