Add priority flag to jobs

- Migration 0010: priority BOOLEAN NOT NULL DEFAULT 0 on print_jobs
- Priority jobs sort above normal jobs in the list
- Checkbox in Add Job modal; warning icon in list; badge on detail page

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

alembic/versions/0010_job_priority.py

@@ -0,0 +1,24 @@
+"""add priority flag to print_jobs
+
+Revision ID: 0010
+Revises: 0009
+Create Date: 2026-06-18
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0010"
+down_revision: Union[str, None] = "0009"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("print_jobs", sa.Column("priority", sa.Boolean(), nullable=False, server_default="0"))
+
+
+def downgrade() -> None:
+    op.drop_column("print_jobs", "priority")