feat: complete moderation history dashboard

apps/api/app/main.py

@@ -162,6 +162,29 @@ def admin_moderation_history(
     return history[offset:offset + limit]
 
 
+@app.get("/api/v1/admin/moderation-history-export")
+def admin_moderation_history_export(
+    db: Db,
+    _: Annotated[str, Depends(_admin)],
+    limit: int = Query(1000, ge=1, le=5000),
+) -> JSONResponse:
+    """Return an anonymized, analysis-safe decision export."""
+    events = admin_moderation_history(db, _, limit=limit, offset=0)
+    payload = {
+        "generated_at": datetime.now(timezone.utc).isoformat(),
+        "count": len(events),
+        "events": [{
+            "entity_type": event.entity_type,
+            "decided_at": event.decided_at.isoformat(),
+            "action": event.action,
+            "requires_confirmation": event.requires_confirmation,
+        } for event in events],
+    }
+    return JSONResponse(payload, headers={
+        "Content-Disposition": "attachment; filename=rf4spotter-moderation-history.json",
+    })
+
+
 @app.get("/api/v1/admin/imports", response_model=list[ImportRunOut])
 def admin_imports(
     db: Db,