feat(ai): add tenant-safe hierarchical expense learning

server/src/app/services/expense_claim_pre_review_decision.py

@@ -210,6 +210,48 @@ def pre_review_public_payload(flag: dict[str, Any] | None) -> dict[str, Any] | N
             for item in list(flag.get("findings") or [])
             if isinstance(item, dict)
         ],
+        "historical_case_evidence": _public_historical_evidence(flag),
+    }
+
+
+def _public_historical_evidence(flag: dict[str, Any]) -> list[dict[str, Any]]:
+    result: list[dict[str, Any]] = []
+    for item in list(flag.get("historical_case_evidence") or []):
+        if not isinstance(item, dict):
+            continue
+        public_item = _historical_evidence_public_payload(item)
+        if public_item is not None:
+            result.append(public_item)
+    return result
+
+
+def _historical_evidence_public_payload(
+    item: dict[str, Any],
+) -> dict[str, Any] | None:
+    label = _text(item.get("label")).lower()
+    if label not in {"confirmed", "false_positive"}:
+        return None
+    return {
+        "label": label,
+        "label_text": (
+            "历史已确认，仅供复核"
+            if label == "confirmed"
+            else "历史误报，仅供复核"
+        ),
+        "advisory_only": True,
+        "score": round(float(item.get("score") or 0.0), 4),
+        "scene_code": _text(item.get("scene_code")),
+        "policy_ref": _text(item.get("policy_ref")),
+        "rule_version": _text(item.get("rule_version")),
+        "version_status": (
+            "stale" if bool(item.get("stale")) else "matched"
+        ),
+        "stale": bool(item.get("stale")),
+        "summary": (
+            "历史相似案例经人工复核确认风险成立。"
+            if label == "confirmed"
+            else "历史相似案例经人工复核判定为误报。"
+        ),
     }