修正北京时间并更换新闻候选源

tests/test_github_client.py

@@ -23,3 +23,5 @@ def test_github_client_maps_repository_to_signal() -> None:
     assert signal.source_url == "https://github.com/example/agent-kit"
     assert "2400 stars" in signal.summary
     assert "2026-05-01" in signal.summary
+    assert signal.published_at is not None
+    assert signal.published_at.hour == 17

tests/test_news_search_client.py

@@ -5,18 +5,22 @@ from app.integrations.news_search_client import NewsSearchClient
 def test_news_search_client_maps_article_to_candidate() -> None:
     # 新闻搜索结果会先转为候选信号，再交给模型筛选成最终情报。
     client = NewsSearchClient(Settings())
-    signal = client._article_to_signal(
+    signal = client._story_to_signal(
         {
-            "title": "AI agent platform launches",
+            "title": "Show HN: AI agent platform launches",
             "url": "https://example.com/ai-agent-platform",
-            "domain": "example.com",
-            "sourcecountry": "US",
-            "seendate": "20260708T120000Z",
+            "author": "builder",
+            "points": 128,
+            "num_comments": 24,
+            "created_at": "2026-07-08T12:00:00Z",
+            "objectID": "123",
         }
     )
 
     assert signal is not None
     assert signal.topic == "AI 新闻候选"
-    assert signal.source_name == "example.com"
+    assert signal.source_name == "Hacker News"
     assert signal.published_at is not None
     assert signal.published_at.year == 2026
+    assert signal.published_at.hour == 20
+    assert "128 points" in signal.summary

tests/test_timezone.py

@@ -0,0 +1,23 @@
+from datetime import datetime, timezone
+
+from app.core.timezone import beijing_now, beijing_today, to_beijing_naive
+
+
+def test_beijing_now_returns_naive_business_time() -> None:
+    # 数据库存储无时区时间，业务层写入前统一生成北京时间。
+    current = beijing_now()
+
+    assert current.tzinfo is None
+
+
+def test_beijing_today_returns_date() -> None:
+    # 日报业务日期只需要日期部分，由北京时间统一决定。
+    assert beijing_today().isoformat()
+
+
+def test_to_beijing_naive_converts_utc_time() -> None:
+    # 外部UTC时间进入数据库前要先换算成北京时间，避免前端显示少8小时。
+    current = to_beijing_naive(datetime(2026, 7, 8, 14, 46, tzinfo=timezone.utc))
+
+    assert current.tzinfo is None
+    assert current.hour == 22