fix: highlight full knowledge search terms

ai_knowledge_base_v2/apps/backend/tests/test_knowledge_admin.py

@@ -359,3 +359,25 @@ def test_content_search_can_exclude_closed_knowledge():
         assert included["data"]["total"] == 1
         assert included["data"]["items"][0]["canAgentUse"] is False
         assert excluded["data"]["total"] == 0
+
+
+def test_content_search_highlight_terms_keep_full_keyword():
+    with _database() as db:
+        item = _knowledge(db)
+        db.add(KnowledgeSection(
+            knowledge_id=item.id,
+            version_id=item.current_version_id,
+            section_key="S0002",
+            title="能力心密钥",
+            content="能力心钥用于说明能力心的核心方向。",
+            source_start=0,
+            source_end=10,
+            sort_order=1,
+            content_hash="highlight-section",
+        ))
+        db.commit()
+
+        response = content_search("心钥", includeClosed=True, page=1, pageSize=10, db=db, current_admin=_admin())
+
+        assert response["data"]["total"] == 1
+        assert response["data"]["items"][0]["highlightTerms"][0] == "心钥"