refactor(repo): consolidate openflare-server to root and move subprojects to internal/apps

- Merge all files inside openflare-server to the repository root directory.
- Relocate agent, relay, and flared subprojects from internal/ to internal/apps/.
- Combine docker-compose files and update build context paths to root.
- Update GitHub workflows and Dockerfiles to refer to new directories and package names.
- Rewrite Go package imports across all files.
- Resolve database renew test race condition and clean up docs.

internal/router/v1/openflare/register_relay_flared.go

@@ -0,0 +1,30 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package openflare
+
+import (
+	"github.com/Rain-kl/Wavelet/internal/apps/openflare/flared"
+	"github.com/Rain-kl/Wavelet/internal/apps/openflare/relay"
+	"github.com/gin-gonic/gin"
+)
+
+func registerRelayRoutes(apiV1Router *gin.RouterGroup) {
+	relayRoute := apiV1Router.Group("/relay")
+	relayRoute.Use(relay.RelayAuth())
+	{
+		relayRoute.POST("/heartbeat", relay.PostHeartbeat)
+		relayRoute.GET("/ws", relay.GetWebSocket)
+	}
+}
+
+func registerTunnelRoutes(apiV1Router *gin.RouterGroup) {
+	tunnelRoute := apiV1Router.Group("/tunnel")
+	tunnelRoute.Use(flared.TunnelAuth())
+	{
+		tunnelRoute.POST("/heartbeat", flared.PostHeartbeat)
+		tunnelRoute.GET("/config/active", flared.GetActiveConfig)
+		tunnelRoute.POST("/apply-log", flared.PostApplyLog)
+		tunnelRoute.GET("/ws", flared.GetWebSocket)
+	}
+}