fix(rag): route exercise titles to knowledge base

ai_knowledge_base_v2/apps/backend/tests/test_knowledge_agent.py

@@ -341,11 +341,14 @@ def test_same_level_practice_headings_are_read_as_one_semantic_unit():
             )
         )
         db.commit()
+        for knowledge_id in range(2, 6):
+            _add_published_knowledge(db, knowledge_id=knowledge_id, name=f"其他课程{knowledge_id}")
 
         content = KnowledgeAgentService._read_complete_section(db, detail)
         result = asyncio.run(
-            KnowledgeAgentService.build_result(db, question="金色光欧姆静心具体怎么练习？")
+            KnowledgeAgentService.build_result(db, question="金色光欧姆是什么？")
         )
+        title_route = next(item for item in result.tool_trace if item["tool"] == "route_knowledge_by_titles")
 
         assert "金色光欧姆静心" in content
         assert "保持自然呼吸" in content
@@ -353,6 +356,7 @@ def test_same_level_practice_headings_are_read_as_one_semantic_unit():
         assert "下一项练习内容" not in content
         assert result.chunks
         assert "保持自然呼吸" in result.chunks[0].content
+        assert title_route["matches"][0]["knowledgeId"] == knowledge.id
 
 
 def test_parser_merges_practice_title_and_same_level_detail_headings():