feat: 添加简单模式功能

新增简单模式设置，适合个人使用场景：
- 隐藏多用户管理相关菜单（用户管理、兑换码等）
- 自动关闭用户注册功能
- 管理员并发数自动设为无限制(99999)
- 侧边栏根据模式动态调整菜单项

同时优化分组页面的"专属分组"功能，添加帮助提示说明使用场景

backend/cmd/server/wire_gen.go

@@ -99,7 +99,7 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	geminiOAuthHandler := admin.NewGeminiOAuthHandler(geminiOAuthService)
 	proxyHandler := admin.NewProxyHandler(adminService)
 	adminRedeemHandler := admin.NewRedeemHandler(adminService)
-	settingHandler := admin.NewSettingHandler(settingService, emailService)
+	settingHandler := admin.NewSettingHandler(settingService, emailService, userService)
 	updateCache := repository.NewUpdateCache(client)
 	gitHubReleaseClient := repository.NewGitHubReleaseClient()
 	serviceBuildInfo := provideServiceBuildInfo(buildInfo)

backend/internal/handler/admin/setting_handler.go

@@ -12,13 +12,15 @@ import (
 type SettingHandler struct {
 	settingService *service.SettingService
 	emailService   *service.EmailService
+	userService    *service.UserService
 }
 
 // NewSettingHandler 创建系统设置处理器
-func NewSettingHandler(settingService *service.SettingService, emailService *service.EmailService) *SettingHandler {
+func NewSettingHandler(settingService *service.SettingService, emailService *service.EmailService, userService *service.UserService) *SettingHandler {
 	return &SettingHandler{
 		settingService: settingService,
 		emailService:   emailService,
+		userService:    userService,
 	}
 }
 
@@ -52,6 +54,7 @@ func (h *SettingHandler) GetSettings(c *gin.Context) {
 		DocUrl:              settings.DocUrl,
 		DefaultConcurrency:  settings.DefaultConcurrency,
 		DefaultBalance:      settings.DefaultBalance,
+		SimpleMode:          settings.SimpleMode,
 	})
 }
 
@@ -86,6 +89,9 @@ type UpdateSettingsRequest struct {
 	// 默认配置
 	DefaultConcurrency int     `json:"default_concurrency"`
 	DefaultBalance     float64 `json:"default_balance"`
+
+	// 使用模式
+	SimpleMode bool `json:"simple_mode"`
 }
 
 // UpdateSettings 更新系统设置
@@ -108,8 +114,14 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		req.SmtpPort = 587
 	}
 
+	// 简单模式下自动关闭开放注册
+	registrationEnabled := req.RegistrationEnabled
+	if req.SimpleMode {
+		registrationEnabled = false
+	}
+
 	settings := &service.SystemSettings{
-		RegistrationEnabled: req.RegistrationEnabled,
+		RegistrationEnabled: registrationEnabled,
 		EmailVerifyEnabled:  req.EmailVerifyEnabled,
 		SmtpHost:            req.SmtpHost,
 		SmtpPort:            req.SmtpPort,
@@ -129,6 +141,7 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		DocUrl:              req.DocUrl,
 		DefaultConcurrency:  req.DefaultConcurrency,
 		DefaultBalance:      req.DefaultBalance,
+		SimpleMode:          req.SimpleMode,
 	}
 
 	if err := h.settingService.UpdateSettings(c.Request.Context(), settings); err != nil {
@@ -136,6 +149,14 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		return
 	}
 
+	// 如果切换到简单模式，自动将管理员并发数设为 99999
+	if req.SimpleMode {
+		admin, err := h.userService.GetFirstAdmin(c.Request.Context())
+		if err == nil && admin != nil {
+			_ = h.userService.UpdateConcurrency(c.Request.Context(), admin.ID, 99999)
+		}
+	}
+
 	// 重新获取设置返回
 	updatedSettings, err := h.settingService.GetAllSettings(c.Request.Context())
 	if err != nil {
@@ -164,6 +185,7 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		DocUrl:              updatedSettings.DocUrl,
 		DefaultConcurrency:  updatedSettings.DefaultConcurrency,
 		DefaultBalance:      updatedSettings.DefaultBalance,
+		SimpleMode:          updatedSettings.SimpleMode,
 	})
 }
 

backend/internal/handler/dto/settings.go

@@ -26,6 +26,8 @@ type SystemSettings struct {
 
 	DefaultConcurrency int     `json:"default_concurrency"`
 	DefaultBalance     float64 `json:"default_balance"`
+
+	SimpleMode bool `json:"simple_mode"` // 简单模式
 }
 
 type PublicSettings struct {
@@ -40,4 +42,5 @@ type PublicSettings struct {
 	ContactInfo         string `json:"contact_info"`
 	DocUrl              string `json:"doc_url"`
 	Version             string `json:"version"`
+	SimpleMode          bool   `json:"simple_mode"` // 简单模式
 }

backend/internal/handler/setting_handler.go

@@ -43,5 +43,6 @@ func (h *SettingHandler) GetPublicSettings(c *gin.Context) {
 		ContactInfo:         settings.ContactInfo,
 		DocUrl:              settings.DocUrl,
 		Version:             h.version,
+		SimpleMode:          settings.SimpleMode,
 	})
 }

backend/internal/service/domain_constants.go

@@ -90,6 +90,9 @@ const (
 
 	// 管理员 API Key
 	SettingKeyAdminApiKey = "admin_api_key" // 全局管理员 API Key（用于外部系统集成）
+
+	// 使用模式
+	SettingKeySimpleMode = "simple_mode" // 简单模式（隐藏多用户管理功能）
 )
 
 // Admin API Key prefix (distinct from user "sk-" keys)

backend/internal/service/setting_service.go

@@ -64,6 +64,7 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings
 		SettingKeyApiBaseUrl,
 		SettingKeyContactInfo,
 		SettingKeyDocUrl,
+		SettingKeySimpleMode,
 	}
 
 	settings, err := s.settingRepo.GetMultiple(ctx, keys)
@@ -82,6 +83,7 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings
 		ApiBaseUrl:          settings[SettingKeyApiBaseUrl],
 		ContactInfo:         settings[SettingKeyContactInfo],
 		DocUrl:              settings[SettingKeyDocUrl],
+		SimpleMode:          settings[SettingKeySimpleMode] == "true",
 	}, nil
 }
 
@@ -123,6 +125,9 @@ func (s *SettingService) UpdateSettings(ctx context.Context, settings *SystemSet
 	updates[SettingKeyDefaultConcurrency] = strconv.Itoa(settings.DefaultConcurrency)
 	updates[SettingKeyDefaultBalance] = strconv.FormatFloat(settings.DefaultBalance, 'f', 8, 64)
 
+	// 使用模式
+	updates[SettingKeySimpleMode] = strconv.FormatBool(settings.SimpleMode)
+
 	return s.settingRepo.SetMultiple(ctx, updates)
 }
 
@@ -223,6 +228,7 @@ func (s *SettingService) parseSettings(settings map[string]string) *SystemSettin
 		ApiBaseUrl:          settings[SettingKeyApiBaseUrl],
 		ContactInfo:         settings[SettingKeyContactInfo],
 		DocUrl:              settings[SettingKeyDocUrl],
+		SimpleMode:          settings[SettingKeySimpleMode] == "true",
 	}
 
 	// 解析整数类型

backend/internal/service/settings_view.go

@@ -25,6 +25,8 @@ type SystemSettings struct {
 
 	DefaultConcurrency int
 	DefaultBalance     float64
+
+	SimpleMode bool // 简单模式
 }
 
 type PublicSettings struct {
@@ -39,4 +41,5 @@ type PublicSettings struct {
 	ContactInfo         string
 	DocUrl              string
 	Version             string
+	SimpleMode          bool // 简单模式
 }

backend/internal/service/user_service.go

@@ -164,6 +164,14 @@ func (s *UserService) UpdateBalance(ctx context.Context, userID int64, amount fl
 	return nil
 }
 
+// UpdateConcurrency 更新用户并发数（管理员功能）
+func (s *UserService) UpdateConcurrency(ctx context.Context, userID int64, concurrency int) error {
+	if err := s.userRepo.UpdateConcurrency(ctx, userID, concurrency); err != nil {
+		return fmt.Errorf("update concurrency: %w", err)
+	}
+	return nil
+}
+
 // UpdateStatus 更新用户状态（管理员功能）
 func (s *UserService) UpdateStatus(ctx context.Context, userID int64, status string) error {
 	user, err := s.userRepo.GetByID(ctx, userID)