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/f6a7b8c9d0e1_add_task_remark.py

@@ -0,0 +1,23 @@
+"""add_task_remark
+
+Revision ID: f6a7b8c9d0e1
+Revises: e5f6a7b8c9d0
+Create Date: 2026-08-05
+
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = "f6a7b8c9d0e1"
+down_revision: Union[str, None] = "e5f6a7b8c9d0"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("tasks", sa.Column("remark", sa.String(2000), nullable=True, comment="任务初始描述/交接备注"))
+
+
+def downgrade() -> None:
+    op.drop_column("tasks", "remark")