feat: 日报结构化入库（M10 前后端分离数据层）

- 新增 report_db 包: MySQL 连接/建表/幂等写入 (news_report/news_event, myquant 库)
- 新增 report_import 包: 历史 178 份日报 HTML 解析入库, 表头驱动列映射
- reporter.py 完全切换: generate_report 结构化入库, 不再生成/上传 HTML
- CLI: 新增 report-import 子命令
- 依赖: uv add pymysql; 配置: NEWS_DB_* / REPORT_HISTORY_DIR
- 文档: docs/report_db_design.md(实现逻辑), docs/db_schema.md(表结构供 API/前端)
- 测试: 24 个单测通过 (parser/builder/models/importer)

tests/test_report_db.py

@@ -0,0 +1,51 @@
+"""日报数据模型单元测试。"""
+
+from __future__ import annotations
+
+from datetime import date, datetime
+
+import pytest
+from pydantic import ValidationError
+
+from report_db.models import EventRow, ReportData
+
+
+class TestEventRow:
+    def test_minimal(self) -> None:
+        ev = EventRow(section="news", rank=1, title="标题")
+        assert ev.importance is None
+        assert ev.sentiment is None
+
+    def test_full(self) -> None:
+        ev = EventRow(
+            section="intl", rank=2, importance=4, event_type="地缘政治",
+            title="t", summary="s", sentiment="negative", source="ForexLive",
+            url="https://x.com/1",
+        )
+        assert ev.sentiment == "negative"
+
+    def test_missing_title_raises(self) -> None:
+        with pytest.raises(ValidationError):
+            EventRow(section="news", rank=1)  # type: ignore[call-arg]
+
+
+class TestReportData:
+    def test_defaults(self) -> None:
+        r = ReportData(
+            report_date=date(2026, 7, 11),
+            report_type="finance",
+            generated_at=datetime(2026, 7, 11, 7, 0),
+        )
+        assert r.file_name == ""
+        assert r.stats == {}
+        assert r.events == []
+
+    def test_with_events(self) -> None:
+        r = ReportData(
+            report_date=date(2026, 7, 11),
+            report_type="finance",
+            generated_at=datetime(2026, 7, 11, 7, 0),
+            ai_summary="摘要",
+            events=[EventRow(section="xwlb", rank=1, title="t")],
+        )
+        assert len(r.events) == 1