feat(investigations): add event impact and work-order feedback flows

Add isolated burst and pollution impact evidence, parallel work-order workflows, persisted notifications and graph updates.

Checkpoint current code. Known follow-ups remain for large pollution result previews and graceful geometry failure.

app/services/operational_recovery.py

@@ -16,7 +16,7 @@ if TYPE_CHECKING:
     from app.services.operational_tasks import OperationalTaskService
 
 
-RECOVERY_WORKFLOWS = {"burst_report", "scada_anomaly"}
+RECOVERY_WORKFLOWS = {"burst_report", "scada_anomaly", "water_pollution"}
 
 
 def track_work_order(task: dict, action: dict) -> bool:
@@ -60,6 +60,8 @@ def accept_completion(task: dict, feedback: dict, *, recorded_at: datetime | Non
     # edits. A revised field receipt can explicitly correct the verification start.
     if feedback["status"] == "completed":
         order["returned_at"] = feedback["occurred_at"]
+        if task.get("workflow") == "water_pollution":
+            order["feedback_evidence_id"] = (feedback.get("evidence") or {}).get("evidence_id")
     else:
         order.pop("returned_at", None)
     if order.get("superseded_by"):
@@ -67,6 +69,13 @@ def accept_completion(task: dict, feedback: dict, *, recorded_at: datetime | Non
     orders = [item for item in context["work_orders"].values() if not item.get("superseded_by")]
     if orders and all(item["status"] == "completed" for item in orders):
         returned_at = max((item["returned_at"] for item in orders), key=datetime.fromisoformat)
+        if task.get("workflow") == "water_pollution":
+            # A completion receipt resumes review, never the pressure-based
+            # automatic recovery calculation. Source revisions may carry new
+            # sampling or retest facts even when the field time is unchanged.
+            context.update(phase="field_review", title="水污染处置反馈复核", returned_at=returned_at)
+            context.pop("verification_evidence_id", None)
+            return True
         previous = context.get("returned_at")
         if (previous is None or datetime.fromisoformat(previous) != datetime.fromisoformat(returned_at)
                 or context.get("phase") == "waiting_work_order"):