feat(qa): add QAReport + QAValidator.validate_doc

tests/test_phase5_report.py

@@ -0,0 +1,23 @@
+from genesis.qa.report import QAReport
+from genesis.qa.validator import QAValidator
+from genesis.writer.models import ChapterContent, ContentBlock
+
+
+def _chapter(cid, text):
+    return ChapterContent(
+        chapter_id=cid, version=1, title=cid,
+        blocks=[ContentBlock(block_id="1", type="paragraph", text=text)],
+    )
+
+
+def test_validate_doc_aggregates_qa_report():
+    v = QAValidator()
+    report = v.validate_doc(
+        [_chapter("a", "充分且规范的说明内容，满足写入规则要求。"), _chapter("b", "x")], None
+    )
+    assert isinstance(report, QAReport)
+    assert report.passed is False
+    assert "b" in report.failed_chapters
+    assert isinstance(report.overall_score, float)
+    assert len(report.per_chapter) == 2
+    assert "未通过" in report.summary