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_scan_engine.py

@@ -0,0 +1,46 @@
+"""全量穿透扫描引擎集成测试（需 PostgreSQL）。
+
+验证场景检测→线索生成→落库的端到端链路（R5+R7+R8/R9）。
+"""
+
+from __future__ import annotations
+
+from app.clues.models import ClueStatus, ConfidenceTier
+from app.engines import scan
+from app.scenarios.churn_fraud import CohortPoint
+from app.scenarios.split_contract import ContractRecord
+
+
+def test_split_scan_creates_high_confidence_clue(session):
+    contracts = [ContractRecord(f"C{i}", f"CUST{i}", 850000) for i in range(8)]
+    result = scan.run_split_contract_scan(
+        session, contracts, approval_threshold=1_000_000, shared_controller=True
+    )
+    assert result.scenario_code == "R8"
+    assert result.scanned_count == 8
+    assert result.clue is not None
+    assert result.clue.confidence == ConfidenceTier.HIGH
+    assert result.clue.status == ClueStatus.NEW
+    assert result.clue.amount_involved > 0
+    assert result.clue.model_version == scan.MODEL_VERSION
+
+
+def test_split_scan_no_clue_when_clean(session):
+    contracts = [ContractRecord("C1", "A", 100000), ContractRecord("C2", "B", 3_000_000)]
+    result = scan.run_split_contract_scan(session, contracts, approval_threshold=1_000_000)
+    assert result.clue is None
+
+
+def test_churn_scan_creates_clue(session):
+    curve = [CohortPoint(0, 1.0), CohortPoint(1, 0.95), CohortPoint(2, 0.1)]
+    result = scan.run_churn_scan(
+        session,
+        retention_curve=curve,
+        commission_paid=300000,
+        active_ratio=0.05,
+        zero_usage_ratio=0.9,
+        channel_key="CH-001",
+    )
+    assert result.clue is not None
+    assert result.clue.scenario_code == "R9"
+    assert result.clue.subjects["channel"] == "CH-001"