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/api/v1/endpoints/users.py

@@ -0,0 +1,75 @@
+"""用户列表 — 对接 MOM sys_user"""
+from fastapi import APIRouter, Query, HTTPException, status
+from pydantic import BaseModel
+from app.core.mom_database import MomSessionLocal
+from sqlalchemy import text
+
+router = APIRouter(prefix="/users", tags=["用户"])
+
+
+class UserOption(BaseModel):
+    id: str
+    username: str
+    full_name: str
+    department: str = ""
+
+    model_config = {"from_attributes": True}
+
+
+@router.get("/", response_model=list[UserOption])
+def list_users(
+    keyword: str = Query("", description="按用户名/姓名模糊搜索"),
+    limit: int = Query(100, ge=1, le=500),
+    dept: str = Query("IRIS", description="部门过滤"),
+):
+    """获取 MOM 系统用户列表，默认只返回 IRIS 部门"""
+    db = MomSessionLocal()
+    try:
+        # 尝试按部门过滤；若 sys_user 无 department 列则降级全量查询
+        try:
+            base_sql = """
+                SELECT id, username,
+                       SPLIT_PART(username, '/', 1) AS full_name,
+                       COALESCE(department, '') AS department
+                FROM sys_user
+                WHERE department = :dept
+            """
+            params = {"dept": dept, "lim": limit}
+            if keyword.strip():
+                sql = text(base_sql + " AND username ILIKE :kw ORDER BY username LIMIT :lim")
+                params["kw"] = f"%{keyword.strip()}%"
+            else:
+                sql = text(base_sql + " ORDER BY username LIMIT :lim")
+            rows = db.execute(sql, params).fetchall()
+        except Exception:
+            # 降级：不使用 department 列过滤
+            fallback_sql = """
+                SELECT id, username,
+                       SPLIT_PART(username, '/', 1) AS full_name,
+                       '' AS department
+                FROM sys_user
+            """
+            params = {"lim": limit}
+            if keyword.strip():
+                sql = text(fallback_sql + " WHERE username ILIKE :kw ORDER BY username LIMIT :lim")
+                params["kw"] = f"%{keyword.strip()}%"
+            else:
+                sql = text(fallback_sql + " ORDER BY username LIMIT :lim")
+            rows = db.execute(sql, params).fetchall()
+
+        return [
+            UserOption(
+                id=str(row.id),
+                username=row.username.split("/")[-1] if "/" in row.username else row.username,
+                full_name=row.full_name,
+                department=row.department or "",
+            )
+            for row in rows
+        ]
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail=f"MOM 用户查询失败: {str(e)}",
+        )
+    finally:
+        db.close()