新增客户端管理功能，包括创建、编辑和删除客户端的API，更新用户管理功能，添加用户创建和编辑页面，优化管理员功能，增强用户和客户端的管理体验。

services/client.go

@@ -209,3 +209,58 @@ func generateSecureToken(length int) string {
 	}
 	return base64.RawURLEncoding.EncodeToString(b)
 }
+
+// GetClients 获取客户端列表（分页）
+func (s *ClientService) GetClients(page, pageSize int) ([]ClientResponse, int64, error) {
+	var clients []models.Client
+	var total int64
+
+	// 获取总数
+	if err := s.db.Model(&models.Client{}).Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	// 获取分页数据
+	offset := (page - 1) * pageSize
+	if err := s.db.Offset(offset).Limit(pageSize).Find(&clients).Error; err != nil {
+		return nil, 0, err
+	}
+
+	// 转换为响应格式
+	responses := make([]ClientResponse, len(clients))
+	for i, client := range clients {
+		// 解析 JSON 字段
+		var redirectURIs, grantTypes, responseTypes, scopes, contacts []string
+		json.Unmarshal(client.RedirectURIs, &redirectURIs)
+		json.Unmarshal(client.GrantTypes, &grantTypes)
+		json.Unmarshal(client.ResponseTypes, &responseTypes)
+		json.Unmarshal(client.Scopes, &scopes)
+		json.Unmarshal(client.Contacts, &contacts)
+
+		responses[i] = ClientResponse{
+			ClientID:                client.ClientID,
+			ClientSecret:            client.ClientSecret,
+			ClientIDIssuedAt:        client.CreatedAt,
+			RedirectURIs:            redirectURIs,
+			TokenEndpointAuthMethod: client.TokenEndpointAuthMethod,
+			GrantTypes:              grantTypes,
+			ResponseTypes:           responseTypes,
+			ClientName:              client.ClientName,
+			ClientURI:               client.ClientURI,
+			LogoURI:                 client.LogoURI,
+			Scope: func() string {
+				if len(scopes) > 0 {
+					return scopes[0]
+				}
+				return ""
+			}(),
+			Contacts:        contacts,
+			TosURI:          client.TosURI,
+			PolicyURI:       client.PolicyURI,
+			SoftwareID:      client.SoftwareID,
+			SoftwareVersion: client.SoftwareVersion,
+		}
+	}
+
+	return responses, total, nil
+}