feat: 添加线索引擎、NLQ、场景检测、前端界面等核心功能模块

backend/tests/integration/test_nlq.py

@@ -0,0 +1,37 @@
+"""NLQ 结构化检索集成测试（需 PostgreSQL）。"""
+
+from __future__ import annotations
+
+from app.engines import scan
+from app.nlq import service as nlq
+from app.scenarios.split_contract import ContractRecord
+
+
+def _seed(session):
+    contracts = [ContractRecord(f"C{i}", f"CUST{i}", 850000) for i in range(8)]
+    scan.run_split_contract_scan(
+        session, contracts, approval_threshold=1_000_000, shared_controller=True
+    )
+    session.flush()
+
+
+def test_nlq_retrieves_split_clues(session):
+    _seed(session)
+    ans = nlq.ask("列出高置信的政企拆单线索", session=session)
+    assert ans.provider == "datahub"
+    assert ans.egress is False
+    assert "政企拆单" in ans.answer
+    assert "共检索到" in ans.answer
+
+
+def test_nlq_no_match(session):
+    ans = nlq.ask("列出养卡骗补线索", session=session)
+    assert ans.egress is False
+    assert "未检索到" in ans.answer or "共检索到" in ans.answer
+
+
+def test_nlq_open_question_falls_back_to_llm(session):
+    # 不含检索关键词 → 走 LLM（mock）
+    ans = nlq.ask("你好，请介绍一下你的能力", session=session)
+    assert ans.provider in ("mock", "datahub")
+    assert ans.egress is False