chore: fork from IRIS track 供 LICA 部门独立运行

- 复制来源: /home/yueli/track @ 192c8ee (feature/ai-audit-update)
- 组织隔离目标: LICA
- 端口规划: 前端 8030 / 后端 8031 / 数据库 8032
- 已排除 deploy.sh、deploy_full.sh、docker-compose.prod.yml（IRIS 生产发布脚本）
- 已排除工作区未提交改动，取干净的 192c8ee 状态

backend/alembic/versions/h1h2h3h4h5h6_add_holidays.py

@@ -0,0 +1,32 @@
+"""add holidays table
+
+Revision ID: h1h2h3h4h5h6
+Revises: g1h2i3j4k5l6
+Create Date: 2026-08-28 12:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = 'h1h2h3h4h5h6'
+down_revision: Union[str, Sequence[str], None] = 'g1h2i3j4k5l6'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        'holidays',
+        sa.Column('id', sa.Integer(), autoincrement=True, primary_key=True),
+        sa.Column('day', sa.Date(), nullable=False, comment='放假日期'),
+        sa.Column('name', sa.String(length=100), nullable=True, comment='放假说明（如国庆节）'),
+    )
+    op.create_index('ix_holidays_day', 'holidays', ['day'], unique=True)
+
+
+def downgrade() -> None:
+    op.drop_index('ix_holidays_day', table_name='holidays')
+    op.drop_table('holidays')