chore(config): update allowed origins from bbs to withyou domain

Update WebSocket and CORS allowed origins to reflect the project rename from "Carrot BBS" to "WithYou", changing bbs.littlelan.cn to withyou.littlelan.cn.

internal/handler/ws_handler.go

@@ -1,4 +1,4 @@
-package handler
+package handler
 
 import (
 	"context"
@@ -38,7 +38,7 @@ var upgrader = websocket.Upgrader{
 }
 
 var allowedWebSocketOrigins = []string{
-	"https://bbs.littlelan.cn",
+	"https://withyou.littlelan.cn",
 	"https://admin.littlelan.cn",
 	"https://browser.littlelan.cn",
 	"http://localhost:3000",