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/b8c9d0e1f2a3_add_notifications.py

@@ -0,0 +1,32 @@
+"""add_notifications
+
+Revision ID: b8c9d0e1f2a3
+Revises: a7b8c9d0e1f2
+Create Date: 2026-08-07
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = "b8c9d0e1f2a3"
+down_revision: Union[str, None] = "a7b8c9d0e1f2"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "notifications",
+        sa.Column("id", sa.UUID(), primary_key=True, server_default=sa.text("gen_random_uuid()")),
+        sa.Column("user_id", sa.String(64), nullable=False, index=True, comment="接收人ID（逻辑外键→老系统）"),
+        sa.Column("title", sa.String(200), nullable=False, comment="通知标题"),
+        sa.Column("content", sa.Text(), nullable=False, comment="通知内容详情"),
+        sa.Column("type", sa.String(20), nullable=False, comment="通知类型: TRANSFER(转交派发) | REJECT(驳回)"),
+        sa.Column("task_id", sa.UUID(), sa.ForeignKey("tasks.id", ondelete="SET NULL"), nullable=True, comment="关联任务ID"),
+        sa.Column("is_read", sa.Boolean(), server_default=sa.text("false"), comment="是否已读"),
+        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), comment="创建时间"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("notifications")