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/app/schemas/user.py

@@ -0,0 +1,34 @@
+"""用户 Schemas — 对接 MOM sys_user 表 + 双 Token"""
+from pydantic import BaseModel, Field
+
+
+class LoginRequest(BaseModel):
+    username: str = Field(..., max_length=64)
+    password: str = Field(..., max_length=128)
+
+
+class UserResponse(BaseModel):
+    id: str
+    username: str
+    display_name: str
+    role: str
+    is_active: bool = True
+    created_at: str | None = None
+
+    model_config = {"from_attributes": True}
+
+
+class LoginResponse(BaseModel):
+    access_token: str
+    refresh_token: str
+    token_type: str = "bearer"
+    user: UserResponse
+
+
+class RefreshRequest(BaseModel):
+    refresh_token: str = Field(..., description="Refresh Token")
+
+
+class RefreshResponse(BaseModel):
+    access_token: str
+    token_type: str = "bearer"