feat(auth): 添加用户存储服务实现

- 实现了基于内存的用户存储服务
- 支持通过ID和名称查找用户
- 注册了用户存储服务的单例模式
- 添加了基础用户数据初始化逻辑

32-platform/sportsstore/admin/auth/user_store.go

@@ -0,0 +1,36 @@
+package auth
+
+import (
+	"platform/authorization/identity"
+	"platform/services"
+	"strings"
+)
+
+func RegisterUserStoreService() {
+	err := services.AddSingleton(func() identity.UserStore {
+		return &userStore{}
+	})
+	if err != nil {
+		panic(err)
+	}
+}
+
+var users = map[int]identity.User{
+	1: identity.NewBasicUser(1, "Alice", "Administrator"),
+}
+
+type userStore struct{}
+
+func (store *userStore) GetUserById(id int) (identity.User, bool) {
+	user, found := users[id]
+	return user, found
+}
+
+func (store *userStore) GetUserByName(name string) (identity.User, bool) {
+	for _, user := range users {
+		if strings.EqualFold(user.GetDisplayName(), name) {
+			return user, true
+		}
+	}
+	return nil, false
+}