feat: 增强知识库功能，优化索引和RAG检索

server/tests/test_knowledge_normalizer.py

@@ -44,9 +44,9 @@ def test_knowledge_normalizer_appends_structured_table(monkeypatch) -> None:
 
         enriched = service.build_enriched_text(raw_text)
 
-    assert enriched.startswith("# 结构化表格补充")
+    assert enriched.startswith(raw_text.strip())
     assert "| 餐补 | 75 | 65 | 55 | 140 |" in enriched
-    assert enriched.endswith(raw_text.strip())
+    assert enriched.endswith("| 合计 | 110 | 100 | 90 | 175 |")
 
 
 def test_knowledge_normalizer_keeps_only_markdown_table_body() -> None:
@@ -79,12 +79,12 @@ def test_knowledge_normalizer_builds_section_navigation_without_table() -> None:
         service = KnowledgeNormalizationService(db)
         enriched = service.build_enriched_text(raw_text)
 
-    assert enriched.startswith("# 章节导航")
+    assert enriched.startswith(raw_text.strip())
     assert "- 第一章 总则" in enriched
     assert "## 第二章 住宿费标准" in enriched
     assert "# 问答线索补充" in enriched
     assert "- 第二章 住宿费标准：住宿费按照出差城市档位和职级标准执行" in enriched
-    assert enriched.endswith(raw_text.strip())
+    assert "# 章节导航" in enriched
 
 
 def test_knowledge_normalizer_builds_answer_clues_from_lists_and_kv_lines() -> None: