feat: initialize warpbox.dev project structure and backend

Initialize the repository with the core Go backend architecture and a frontend mockup for warpbox.dev, a self-hosted file-sharing application.

- Set up Go backend modules for configuration, HTTP server, middleware, handlers, and templates.
- Add local development scripts, environment templates, and basic project configuration.
- Include a React-based frontend mockup under the docs directory.

backend/libs/httpserver/server.go

@@ -0,0 +1,42 @@
+package httpserver
+
+import (
+	"log/slog"
+	"net/http"
+
+	"warpbox.dev/backend/libs/config"
+	"warpbox.dev/backend/libs/handlers"
+	"warpbox.dev/backend/libs/middleware"
+	"warpbox.dev/backend/libs/services"
+	"warpbox.dev/backend/libs/web"
+)
+
+func New(cfg config.Config, logger *slog.Logger) (*http.Server, error) {
+	renderer, err := web.NewRenderer(cfg.TemplateDir, cfg.AppName, cfg.BaseURL)
+	if err != nil {
+		return nil, err
+	}
+
+	uploadService := services.NewUploadService(cfg.MaxUploadSize)
+	app := handlers.NewApp(cfg, logger, renderer, uploadService)
+
+	router := http.NewServeMux()
+	app.RegisterRoutes(router)
+
+	handler := middleware.Chain(
+		router,
+		middleware.Recoverer(logger),
+		middleware.RequestID,
+		middleware.SecurityHeaders,
+		middleware.Gzip,
+		middleware.Logger(logger),
+	)
+
+	return &http.Server{
+		Addr:         cfg.Addr,
+		Handler:      handler,
+		ReadTimeout:  cfg.ReadTimeout,
+		WriteTimeout: cfg.WriteTimeout,
+		IdleTimeout:  cfg.IdleTimeout,
+	}, nil
+}