Fix missing Numeric import in print_job model

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/models/print_job.py

@@ -3,7 +3,7 @@ import uuid as _uuid
 from datetime import datetime
 from decimal import Decimal
 
-from sqlalchemy import DateTime, Enum, ForeignKey, Integer, String, Text, func
+from sqlalchemy import DateTime, Enum, ForeignKey, Integer, Numeric, String, Text, func
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.models.base import Base