feat: 并发分组系统 + 品牌/Logo 上传 + 兑换码开关 + 文档分辨率表

并发分组(新功能):
- 新表 concurrency_groups(名称/上限/默认),用户加 concurrency_group_id
- 启动自动建「默认并发」组(上限10、默认),老用户回填、新注册自动绑定
- 并发计数改用 Redis(自愈 sorted-set + TTL + fail-open):
  · 用户并发(画图台 + API key 合计)受其分组上限限制,0=不限制 → 超返回 429
  · 账号级并发也从内存 gate 换成同一套 Redis(6 处调用点)
  · 移除旧的「已有正在生成的任务」单任务锁
- 后台「并发分组」新菜单:增删改、设默认、用户数;默认组不可删(删别的组成员转默认)
- 用户管理:并发列 + 新建/编辑可选分组
- 个人设置页:账户信息卡(用户名/邮箱/角色/余额/并发);/me 暴露 concurrency_group/limit

品牌 / Logo(上传到 RustFS):
- Logo 改成拖拽/点击上传,点保存才上传;替换自动删旧;branding/ 设为公开且被清理任务 pin 住(永不删)
- 有自定义就用:前台左侧 nav + 后台侧栏 + favicon(浏览器标签);没有则默认 V 图标
- 前台页头还原成文字;首页 Hero 子标题用 site.subtitle(默认那句宣传语,设置页预填)
- 邮件验证码标题用站点名;新增 POST/DELETE /settings/logo + POST /settings/asset(首页底图上传)

兑换码开关:
- 系统设置→积分 新增「开启兑换码」(默认开);关闭后后端拒绝兑换、前台隐藏兑换入口(/site 暴露 cdk_redeem_enabled)

文档 / 分辨率:
- 去掉 quality 参数:size(宽x高)同时决定比例 + 分辨率档(长边映射 1K/2K/4K)
- 文档加「分辨率对照表」(14 个比例 × 1K/2K/4K → size 该传的值);guessRatio 与自定义模型 RATIO_OPTS 对齐到 14 个

其它:
- 删模型时同步清掉各上游账号「支持模型」里的该 id
- 首页设置/兑换码弹窗去固定高度滚动条;展示位弹窗浅色主题适配

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/internal/bootstrap/app.go

@@ -3,6 +3,7 @@ package bootstrap
 import (
 	"context"
 	"fmt"
+	"log"
 	"os"
 	"time"
 
@@ -96,12 +97,19 @@ func NewApp(ctx context.Context) (*App, error) {
 	apiKeyRepo := repo.NewAPIKeyRepository(db)
 	tokenRepo := repo.NewTokenRepository(db)
 	refreshRepo := repo.NewRefreshProfileRepository(db)
+	cgroupRepo := repo.NewConcurrencyGroupRepository(db)
+	// Seed the "默认并发" group (cap 10) and bind any ungrouped users to it.
+	if err := cgroupRepo.EnsureDefault(ctx); err != nil {
+		log.Printf("ensure default concurrency group: %v", err)
+	}
+	concSvc := service.NewConcurrencyService(rdb)
+	cgroupSvc := service.NewConcurrencyGroupService(cgroupRepo, concSvc)
 	sessionSvc := service.NewSessionService(rdb, cfg.SessionTTL, cfg.SessionSlideAfter)
 	emailCodeSvc := service.NewEmailCodeService(rdb)
 	smtpSvc := service.NewSMTPService()
 	rateLimitSvc := service.NewRateLimitService(rdb)
 	rustfsClient := storage.New(cfg.RustFSEndpoint, cfg.RustFSBucket, cfg.RustFSAccessKey, cfg.RustFSSecretKey)
-	authSvc := service.NewAuthService(userRepo, siteRepo, sessionSvc, emailCodeSvc, smtpSvc)
+	authSvc := service.NewAuthService(userRepo, siteRepo, sessionSvc, emailCodeSvc, smtpSvc, cgroupRepo)
 	appSettingsSvc := service.NewAppSettingsService(siteRepo, eventRepo, smtpSvc, rustfsClient)
 	imageAccessSvc := service.NewImageAccessService(cfg.GeneratedRoot, showcaseRepo, authSvc)
 	adobeClient := adobe.NewClient("clio-playground-web", "")
@@ -112,12 +120,12 @@ func NewApp(ctx context.Context) (*App, error) {
 	imagineClient := imagine.NewClient("")
 	grokClient := grok.NewClient("")
 	customClient := custom.NewClient()
-	v1Svc := service.NewV1Service(cfg, modelRepo, userRepo, eventRepo, tokenRepo, siteRepo, adobeClient, chatGPTClient, runwayClient, leonardoClient, kreaClient, imagineClient, grokClient, customClient, rustfsClient)
+	v1Svc := service.NewV1Service(cfg, modelRepo, userRepo, eventRepo, tokenRepo, siteRepo, cgroupRepo, concSvc, adobeClient, chatGPTClient, runwayClient, leonardoClient, kreaClient, imagineClient, grokClient, customClient, rustfsClient)
 	siteSvc := service.NewSiteService(siteRepo, cfg.AppTitle)
 	showcaseSvc := service.NewShowcaseService(showcaseRepo)
 	adminReadSvc := service.NewAdminReadService(cfg, userRepo, modelRepo, eventRepo, siteRepo, tokenRepo, cdkRepo, rustfsClient)
-	adminWriteSvc := service.NewAdminWriteService(userRepo, showcaseRepo, modelRepo, eventRepo, apiKeyRepo)
-	cdkSvc := service.NewCDKService(cdkRepo, userRepo)
+	adminWriteSvc := service.NewAdminWriteService(userRepo, showcaseRepo, modelRepo, eventRepo, apiKeyRepo, tokenRepo)
+	cdkSvc := service.NewCDKService(cdkRepo, userRepo, siteRepo)
 	apiKeySvc := service.NewAPIKeyService(apiKeyRepo)
 	tokenSvc := service.NewTokenService(tokenRepo, refreshRepo, eventRepo, siteRepo, adobeClient, chatGPTClient, runwayClient, leonardoClient, kreaClient, imagineClient, grokClient)
 	refreshSvc := service.NewRefreshProfileService(refreshRepo, tokenRepo, adobeClient)
@@ -141,6 +149,7 @@ func NewApp(ctx context.Context) (*App, error) {
 		UserTools:     handler.NewUserToolsHandler(apiKeySvc, cdkSvc),
 		UserGen:       handler.NewUserGenerationHandler(userGenSvc, adminReadSvc),
 		ProviderAdmin: handler.NewProviderAdminHandler(tokenSvc, refreshSvc),
+		ConcGroups:    handler.NewConcurrencyGroupHandler(cgroupSvc),
 	})
 
 	// Background self-healing sweep (quota recovery, cookie refresh, stale-pending

backend/internal/bootstrap/seed.go

@@ -34,6 +34,7 @@ func seedDefaults(ctx context.Context, db *gorm.DB) error {
 		{Key: "credits.checkin_reward", Value: "3"},
 		{Key: "credits.invite_enabled", Value: "true"},
 		{Key: "credits.invite_reward", Value: "3"},
+		{Key: "credits.cdk_redeem_enabled", Value: "true"},
 		{Key: "logs.retention_days", Value: "30"},
 		{Key: "media.retention_days", Value: "30"},
 	}