feat(djapi): 新增日报查询 API（news/reports + news/events）及文档

- api/report/ 包：query（连库+SQL）/ views（2 视图）/ serializers（OpenAPI）/ tests（17 单测）
- urls.py 注册 news/reports/、news/events/；settings.py SPECTACULAR 加「日报」tag
- .env.example 补 NEWS_DB_* 占位配置；README/continuation.md 更新
- docs/news_report_api.md 使用手册；CLAUDE*.md 修正 CLI 路径为 finance/ 前缀

djapi/api/report/serializers.py

@@ -0,0 +1,50 @@
+"""日报查询 API 的 OpenAPI 文档 serializer（只读，不用于反序列化）。"""
+
+from rest_framework import serializers
+
+
+class EventSerializer(serializers.Serializer):
+    """日报事件明细（news_event 一行）"""
+    id = serializers.IntegerField()
+    section = serializers.CharField()
+    rank = serializers.IntegerField()
+    importance = serializers.IntegerField(allow_null=True)
+    event_type = serializers.CharField(allow_null=True)
+    title = serializers.CharField()
+    summary = serializers.CharField(allow_null=True)
+    sentiment = serializers.CharField(allow_null=True)
+    source = serializers.CharField(allow_null=True)
+    url = serializers.CharField(allow_null=True)
+
+
+class ReportListSerializer(serializers.Serializer):
+    """日报列表项（news_report 主表字段）"""
+    id = serializers.IntegerField()
+    report_date = serializers.CharField()
+    report_type = serializers.CharField()
+    file_name = serializers.CharField()
+    generated_at = serializers.CharField()
+    ai_summary = serializers.CharField(allow_null=True)
+    stats = serializers.JSONField(allow_null=True)
+    created_at = serializers.CharField()
+
+
+class ReportDetailSerializer(ReportListSerializer):
+    """日报详情（主表字段 + 事件列表）"""
+    events = EventSerializer(many=True)
+
+
+class ImportantEventSerializer(serializers.Serializer):
+    """跨日报重要事件聚合（news_event JOIN news_report）"""
+    report_date = serializers.CharField()
+    report_type = serializers.CharField()
+    id = serializers.IntegerField()
+    section = serializers.CharField()
+    rank = serializers.IntegerField()
+    importance = serializers.IntegerField(allow_null=True)
+    event_type = serializers.CharField(allow_null=True)
+    title = serializers.CharField()
+    summary = serializers.CharField(allow_null=True)
+    sentiment = serializers.CharField(allow_null=True)
+    source = serializers.CharField(allow_null=True)
+    url = serializers.CharField(allow_null=True)