feat: 易支付积分充值 + 站内公告 + OpenAI 视频修复 + grok/adobe 失败处理

充值/订单(易支付 mapi):
- 订单表 + 30 分钟自动取消;支付弹窗(二维码/跳转监控、倒计时、轮询、5s 倒计时关闭)
- 系统设置可配:开关/商户ID/密钥/支付地址(根地址拼 /mapi)/支付方式/最低额/积分比例(默认 1元=100积分)
- 异步通知 MD5 验签、幂等到账;用户累计充值;前台/后台订单页(筛选+搜索+分页,前后台分风格);用户管理累计充值列

站内公告:
- Markdown 公告,登录用户首次访问/刷新弹出;内容哈希做版本,改了就重新推;管理员不弹;空内容=下线

OpenAI 视频(/v1/videos)修复:
- /content 拿不到视频:grok 资源 URL 需鉴权,改为用生成账号 token 取流;adobe/runway 公开 URL 直代理(不存 RustFS)
- size→分辨率用短边判定(1280x720 = 720p,之前误判 1080p 被拒)

失败处理:
- grok 429「Too many requests」/403 anti-bot 改判临时错误(不再误封号),真额度耗尽才算 quota
- adobe 视频 408 / system under load 归为临时错误 → tempAsDead 封号

其它:
- 充值默认关闭;签到格子浅色可见;登录验证码按钮浅色可读;并发/账户信息展示
- 创作记录/画图台只显示画图台作品(排除 API);日志页 API 视频预览显示 —
- 视频去画中画/下载/投屏(全局);图片缩略图改背景图规避 Edge 视觉搜索
- 订单/兑换码/配置/日志菜单文案与图标;充值版块样式

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

backend/internal/bootstrap/app.go

@@ -104,6 +104,9 @@ func NewApp(ctx context.Context) (*App, error) {
 	}
 	concSvc := service.NewConcurrencyService(rdb)
 	cgroupSvc := service.NewConcurrencyGroupService(cgroupRepo, concSvc)
+	announcementSvc := service.NewAnnouncementService(siteRepo, userRepo)
+	orderRepo := repo.NewOrderRepository(db)
+	paymentSvc := service.NewPaymentService(orderRepo, userRepo, siteRepo)
 	sessionSvc := service.NewSessionService(rdb, cfg.SessionTTL, cfg.SessionSlideAfter)
 	emailCodeSvc := service.NewEmailCodeService(rdb)
 	smtpSvc := service.NewSMTPService()
@@ -150,11 +153,13 @@ func NewApp(ctx context.Context) (*App, error) {
 		UserGen:       handler.NewUserGenerationHandler(userGenSvc, adminReadSvc),
 		ProviderAdmin: handler.NewProviderAdminHandler(tokenSvc, refreshSvc),
 		ConcGroups:    handler.NewConcurrencyGroupHandler(cgroupSvc),
+		Announcement:  handler.NewAnnouncementHandler(announcementSvc),
+		Payment:       handler.NewPaymentHandler(paymentSvc),
 	})
 
 	// Background self-healing sweep (quota recovery, cookie refresh, stale-pending
 	// cleanup, log retention) — the Go equivalent of the Python daemon thread.
-	maintenanceSvc := service.NewMaintenanceService(tokenRepo, tokenSvc, eventRepo, userRepo, refreshSvc, siteRepo, rustfsClient, v1Svc.Inflight(), showcaseRepo)
+	maintenanceSvc := service.NewMaintenanceService(tokenRepo, tokenSvc, eventRepo, userRepo, refreshSvc, siteRepo, rustfsClient, v1Svc.Inflight(), showcaseRepo, orderRepo)
 	loopCtx, loopCancel := context.WithCancel(context.Background())
 	go maintenanceSvc.Run(loopCtx)