feat: display provenance and incomplete signals

apps/api/app/activity.py

@@ -69,10 +69,22 @@ def activity_rows(
             max_weight_g=max(r.weight_g for r in items), last_confirmed_at=latest,
             activity_score=activity, confidence_score=confidence,
             explanation=_explanation(len(items), len(players), freshness_text, activity, confidence),
+            sources=sorted({_source_system(item) for item in items}),
         ))
     return sorted(result, key=lambda row: (row.activity_score, row.last_confirmed_at), reverse=True)
 
 
+def _source_system(report: CatchReport) -> str:
+    provenance = (report.raw_payload or {}).get("provenance", {})
+    if isinstance(provenance, dict) and provenance.get("source_system"):
+        return str(provenance["source_system"])
+    if report.source_type.value == "official_record":
+        return "rf4-official"
+    if report.source_type.value == "user":
+        return "players"
+    return "manual-import"
+
+
 def _aware(value: datetime) -> datetime:
     return value if value.tzinfo else value.replace(tzinfo=timezone.utc)