feat: add admin dashboard, pipeline service, lightbox, and update dependencies

tests/conftest.py

@@ -3,14 +3,12 @@
 from __future__ import annotations
 
 import json
-from datetime import date, datetime, timezone
-from pathlib import Path
-from unittest.mock import AsyncMock
+from datetime import date
 
 import pytest
 from fastapi.testclient import TestClient
 from sqlalchemy import create_engine, event
-from sqlalchemy.orm import DeclarativeBase, sessionmaker
+from sqlalchemy.orm import sessionmaker
 from sqlalchemy.pool import StaticPool
 
 from app.database import get_db
@@ -23,21 +21,12 @@ from app.models import (
     PaperTag,
     SummaryStatus,
 )
+from app.utils import utc_now
 
 
 # ── 内存数据库 ──────────────────────────────────────────────────────────
 
 
-class _TestBase(DeclarativeBase):
-    pass
-
-
-# 复用 app.models 的 Base metadata
-from app.database import Base as _AppBase  # noqa: E402
-
-_TestBase.metadata = _AppBase.metadata
-
-
 @pytest.fixture
 def db_engine():
     """创建内存 SQLite 引擎 + FTS5。"""
@@ -94,7 +83,7 @@ _TEST_ADMIN_PASSWORD = "test-password-12345"
 @pytest.fixture
 def sample_paper(db_session):
     """插入一篇测试论文 + 作者 + 标签 + summary_status(pending)。"""
-    now = datetime.now(timezone.utc)
+    now = utc_now()
     paper = Paper(
         arxiv_id=SAMPLE_ARXIV_ID,
         title_en="Test Paper Title",
@@ -234,7 +223,7 @@ def auth_client(client, monkeypatch):
 @pytest.fixture
 def sample_papers_range(db_session):
     """插入 5 篇不同日期的论文（用于 admin / cleaner 测试）。"""
-    now = datetime.now(timezone.utc)
+    now = utc_now()
     papers = []
     for i, (arxiv_id, paper_date_str) in enumerate(
         [
@@ -281,7 +270,7 @@ def sample_papers_range(db_session):
 @pytest.fixture
 def sample_papers_with_summary(db_session):
     """插入 5 篇带总结的论文（用于 search / pages / trends 测试）。"""
-    now = datetime.now(timezone.utc)
+    now = utc_now()
     papers = []
     for i, (arxiv_id, paper_date_str) in enumerate(
         [