merge: 正确合并 main 分支改动

合并 origin/main 最新改动，正确保留所有配置：
- Ops 运维监控配置和功能
- LinuxDo Connect OAuth 配置
- Update 在线更新配置
- 优惠码功能
- 其他 main 分支新功能

修复之前合并时错误删除 LinuxDo 和 Update 配置的问题。

backend/internal/server/router.go

@@ -1,6 +1,8 @@
 package server
 
 import (
+	"log"
+
 	"github.com/Wei-Shaw/sub2api/internal/config"
 	"github.com/Wei-Shaw/sub2api/internal/handler"
 	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
@@ -9,6 +11,7 @@ import (
 	"github.com/Wei-Shaw/sub2api/internal/web"
 
 	"github.com/gin-gonic/gin"
+	"github.com/redis/go-redis/v9"
 )
 
 // SetupRouter 配置路由器中间件和路由
@@ -21,20 +24,30 @@ func SetupRouter(
 	apiKeyService *service.APIKeyService,
 	subscriptionService *service.SubscriptionService,
 	opsService *service.OpsService,
+	settingService *service.SettingService,
 	cfg *config.Config,
+	redisClient *redis.Client,
 ) *gin.Engine {
 	// 应用中间件
 	r.Use(middleware2.Logger())
 	r.Use(middleware2.CORS(cfg.CORS))
 	r.Use(middleware2.SecurityHeaders(cfg.Security.CSP))
 
-	// Serve embedded frontend if available
+	// Serve embedded frontend with settings injection if available
 	if web.HasEmbeddedFrontend() {
-		r.Use(web.ServeEmbeddedFrontend())
+		frontendServer, err := web.NewFrontendServer(settingService)
+		if err != nil {
+			log.Printf("Warning: Failed to create frontend server with settings injection: %v, using legacy mode", err)
+			r.Use(web.ServeEmbeddedFrontend())
+		} else {
+			// Register cache invalidation callback
+			settingService.SetOnUpdateCallback(frontendServer.InvalidateCache)
+			r.Use(frontendServer.Middleware())
+		}
 	}
 
 	// 注册路由
-	registerRoutes(r, handlers, jwtAuth, adminAuth, apiKeyAuth, apiKeyService, subscriptionService, opsService, cfg)
+	registerRoutes(r, handlers, jwtAuth, adminAuth, apiKeyAuth, apiKeyService, subscriptionService, opsService, cfg, redisClient)
 
 	return r
 }
@@ -50,6 +63,7 @@ func registerRoutes(
 	subscriptionService *service.SubscriptionService,
 	opsService *service.OpsService,
 	cfg *config.Config,
+	redisClient *redis.Client,
 ) {
 	// 通用路由（健康检查、状态等）
 	routes.RegisterCommonRoutes(r)
@@ -58,7 +72,7 @@ func registerRoutes(
 	v1 := r.Group("/api/v1")
 
 	// 注册各模块路由
-	routes.RegisterAuthRoutes(v1, h, jwtAuth)
+	routes.RegisterAuthRoutes(v1, h, jwtAuth, redisClient)
 	routes.RegisterUserRoutes(v1, h, jwtAuth)
 	routes.RegisterAdminRoutes(v1, h, adminAuth)
 	routes.RegisterGatewayRoutes(r, h, apiKeyAuth, apiKeyService, subscriptionService, opsService, cfg)