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/apps/openflare/relay/routers.go

@@ -0,0 +1,66 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package relay
+
+import (
+	"net/http"
+
+	"github.com/Rain-kl/Wavelet/internal/apps/openflare/apiutil"
+	ofws "github.com/Rain-kl/Wavelet/internal/apps/openflare/websocket"
+	"github.com/Rain-kl/Wavelet/internal/common/response"
+	"github.com/Rain-kl/Wavelet/internal/model"
+	"github.com/gin-gonic/gin"
+)
+
+// PostHeartbeat handles POST /relay/heartbeat.
+// @Summary 上报 Relay 心跳
+// @Description Relay 节点定期上报运行状态与 frps 观测数据，返回运行时配置
+// @Tags openflare-relay
+// @Accept json
+// @Produce json
+// @Security AgentTokenAuth
+// @Param body body relay.HeartbeatPayload true "心跳载荷"
+// @Success 200 {object} response.Any{data=relay.HeartbeatResponse} "心跳响应"
+// @Failure 400 {object} response.Any "参数错误"
+// @Failure 401 {object} response.Any "Agent Token 无效"
+// @Failure 403 {object} response.Any "节点类型不匹配"
+// @Router /api/v1/relay/heartbeat [post]
+func PostHeartbeat(c *gin.Context) {
+	var payload HeartbeatPayload
+	if !apiutil.BindJSON(c, &payload) {
+		return
+	}
+	payload.IP = resolveReportedNodeIP(payload.IP, c.Request.RemoteAddr)
+
+	authNode, ok := c.Get(ctxRelayNodeKey)
+	if !ok {
+		response.AbortUnauthorized(c, errAgentTokenInvalid)
+		return
+	}
+	node := authNode.(*model.OpenFlareNode)
+
+	result, err := Heartbeat(c.Request.Context(), node, payload)
+	if apiutil.AbortBadRequestOnError(c, err) {
+		return
+	}
+	c.JSON(http.StatusOK, response.OK(result))
+}
+
+// GetWebSocket handles GET /relay/ws.
+// @Summary 升级 Relay WebSocket 连接
+// @Description 将已认证的 Relay 连接升级为 WebSocket 长连接，用于配置推送
+// @Tags openflare-relay
+// @Security AgentTokenAuth
+// @Failure 401 {object} response.Any "Agent Token 无效"
+// @Failure 403 {object} response.Any "节点类型不匹配"
+// @Router /api/v1/relay/ws [get]
+func GetWebSocket(c *gin.Context) {
+	authNode, ok := c.Get(ctxRelayNodeKey)
+	if !ok {
+		response.AbortUnauthorized(c, errAgentTokenInvalid)
+		return
+	}
+	node := authNode.(*model.OpenFlareNode)
+	ofws.ServeRelay(c, node.NodeID)
+}