refactor(repo): replace legacy openflare-server with Wavelet rename

Delete the old monolithic openflare-server implementation and rename
Wavelet/ to openflare-server/ to complete the migration consolidation.
Update CI workflows, agent Dockerfiles, and deployment docs for the new
layout (frontend/, docker/Dockerfile).

openflare-server/internal/router/v1/custom.go

@@ -0,0 +1,18 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package v1 contains router registrations for API V1
+package v1
+
+import (
+	"github.com/Rain-kl/Wavelet/internal/apps/custom"
+	"github.com/gin-gonic/gin"
+)
+
+// RegisterCustomRoutes registers custom business routes to keep routing clean and stable.
+func RegisterCustomRoutes(apiV1Router *gin.RouterGroup) {
+	customRouter := apiV1Router.Group("/custom")
+	{
+		customRouter.GET("/hello", custom.Hello)
+	}
+}