refactor: 移除旧版数据库配置的简易模式实现

移除与 PR #66 冲突的旧版简易模式实现（commit 7d4b7de）。
新版简易模式通过 run_mode 配置文件/环境变量控制，无需数据库设置。

后端变更：
- 移除 SettingKeySimpleMode 常量
- 移除 SystemSettings/PublicSettings 中的 SimpleMode 字段
- 移除 setting_handler 中的简易模式切换逻辑
- 移除 userService 依赖（不再需要自动设置管理员并发数）

前端变更：
- 移除 appStore.simpleMode 状态
- 移除设置页面的"使用模式"设置区块
- 移除 GroupsView 中的简易模式相关逻辑
- 移除相关国际化文案

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, userService)
+	settingHandler := admin.NewSettingHandler(settingService, emailService)
 	updateCache := repository.NewUpdateCache(client)
 	gitHubReleaseClient := repository.NewGitHubReleaseClient()
 	serviceBuildInfo := provideServiceBuildInfo(buildInfo)

backend/internal/handler/admin/setting_handler.go

@@ -12,15 +12,13 @@ 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, userService *service.UserService) *SettingHandler {
+func NewSettingHandler(settingService *service.SettingService, emailService *service.EmailService) *SettingHandler {
 	return &SettingHandler{
 		settingService: settingService,
 		emailService:   emailService,
-		userService:    userService,
 	}
 }
 
@@ -54,7 +52,6 @@ func (h *SettingHandler) GetSettings(c *gin.Context) {
 		DocUrl:              settings.DocUrl,
 		DefaultConcurrency:  settings.DefaultConcurrency,
 		DefaultBalance:      settings.DefaultBalance,
-		SimpleMode:          settings.SimpleMode,
 	})
 }
 
@@ -89,9 +86,6 @@ 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
@@ -114,14 +108,8 @@ 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: registrationEnabled,
+		RegistrationEnabled: req.RegistrationEnabled,
 		EmailVerifyEnabled:  req.EmailVerifyEnabled,
 		SmtpHost:            req.SmtpHost,
 		SmtpPort:            req.SmtpPort,
@@ -141,7 +129,6 @@ 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 {
@@ -149,14 +136,6 @@ 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 && h.userService != nil {
-		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 {
@@ -185,7 +164,6 @@ 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

@@ -26,8 +26,6 @@ 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 {
@@ -42,5 +40,4 @@ 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

@@ -43,6 +43,5 @@ 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

@@ -90,9 +90,6 @@ 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

@@ -64,7 +64,6 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings
 		SettingKeyApiBaseUrl,
 		SettingKeyContactInfo,
 		SettingKeyDocUrl,
-		SettingKeySimpleMode,
 	}
 
 	settings, err := s.settingRepo.GetMultiple(ctx, keys)
@@ -83,7 +82,6 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings
 		ApiBaseUrl:          settings[SettingKeyApiBaseUrl],
 		ContactInfo:         settings[SettingKeyContactInfo],
 		DocUrl:              settings[SettingKeyDocUrl],
-		SimpleMode:          settings[SettingKeySimpleMode] == "true",
 	}, nil
 }
 
@@ -125,9 +123,6 @@ 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)
 }
 
@@ -228,7 +223,6 @@ 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

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