feat(user): 添加用户分页列表接口及通用查询封装

internal/service/user_ser/page.go

@@ -0,0 +1,27 @@
+package user_ser
+
+import (
+	"EnGin/internal/db"
+	"EnGin/internal/ent"
+	"EnGin/internal/ent/user"
+	"EnGin/internal/service/common"
+	"context"
+
+	"entgo.io/ent/dialect/sql"
+)
+
+func GetUserListWithPage(ctx context.Context, usernameKey string, page, limit int) ([]*ent.User, int, error) {
+	return common.QueryList(ctx, db.Client.User.Query(), common.QueryOptions[*ent.UserQuery]{
+		Page:  page,
+		Limit: limit,
+		Query: func(q *ent.UserQuery) *ent.UserQuery {
+			// 模糊匹配（编译期安全，杜绝拼写错误）
+			if usernameKey != "" {
+				q = q.Where(user.UsernameContains(usernameKey))
+			}
+
+			// 预加载关联角色，并按照创建时间倒序
+			return q.WithRoles().Order(user.ByCreatedAt(sql.OrderDesc()))
+		},
+	})
+}