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/root/default.go

@@ -0,0 +1,32 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package root
+
+import (
+	_ "github.com/Rain-kl/Wavelet/docs" // Swagger documentation generation setup
+	publicconfig "github.com/Rain-kl/Wavelet/internal/apps/config"
+	"github.com/Rain-kl/Wavelet/internal/apps/health"
+	"github.com/Rain-kl/Wavelet/internal/apps/upload"
+	"github.com/Rain-kl/Wavelet/internal/config"
+	"github.com/gin-gonic/gin"
+	swaggerFiles "github.com/swaggo/files"
+	ginSwagger "github.com/swaggo/gin-swagger"
+)
+
+// RegisterDefaultRootRoutes registers default routes that belong to the root path.
+func RegisterDefaultRootRoutes(r *gin.Engine) {
+	// 1. Serve files by ID
+	r.GET("/f/:id", upload.ServeFileByID)
+
+	// 2. Dynamic robots.txt serving
+	r.GET("/robots.txt", publicconfig.GetRobotsTXT)
+
+	// 3. Swagger routes (Non-production only)
+	if !config.Config.App.IsProduction() {
+		r.GET(config.Config.App.APIPrefix+"/swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))
+	}
+
+	// 4. Health check
+	r.GET(config.Config.App.APIPrefix+"/health", health.Health)
+}