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.

main.go

@@ -0,0 +1,22 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package main 是 OpenFlare 平台的程序入口
+package main
+
+import "github.com/Rain-kl/Wavelet/internal/cmd"
+
+// @title OpenFlare API
+// @version 1.0.0
+// @description OpenFlare 平台后端 API，提供用户认证、系统配置、任务调度与边缘节点管理能力。
+// @contact.name OpenFlare
+// @contact.url https://github.com/Rain-kl/OpenFlare
+// @license.name Apache 2.0
+// @license.url http://www.apache.org/licenses/LICENSE-2.0.html
+// @BasePath /
+// @securityDefinitions.apikey SessionCookie
+// @in cookie
+// @name session
+func main() {
+	cmd.Execute()
+}