Добавить установщик, проверку версий и инструкцию деплоя на сервер.

Интерактивная настройка домена и БД, эндпоинты /health и /version,
скрипты install/check для Linux и Windows.

Co-authored-by: Cursor <cursoragent@cursor.com>

cmd/server/main.go

@@ -11,10 +11,12 @@ import (
 	"syscall"
 	"time"
 
+	"shop/internal/check"
 	"shop/internal/config"
 	"shop/internal/database"
 	"shop/internal/handlers"
 	"shop/internal/repository"
+	"shop/internal/version"
 	"shop/internal/web"
 )
 
@@ -31,6 +33,17 @@ func main() {
 	}
 	defer pool.Close()
 
+	startupReport, err := check.WithDatabase(ctx, pool)
+	if err != nil {
+		log.Fatalf("version check: %v", err)
+	}
+	for _, it := range startupReport.Items {
+		if it.Name == "postgresql" && it.Status == check.StatusWarn {
+			log.Printf("warning: %s — %s", it.Name, it.Detail)
+		}
+	}
+	log.Printf("ShopNova %s | Go %s | PostgreSQL check OK", version.AppVersion, version.GoRuntime())
+
 	tmpl, err := loadTemplates()
 	if err != nil {
 		log.Fatalf("templates: %v", err)
@@ -38,6 +51,7 @@ func main() {
 
 	products := repository.NewProductRepository(pool)
 	home := handlers.NewHomeHandler(products, tmpl)
+	health := handlers.NewHealthHandler(pool)
 
 	staticSub, err := fs.Sub(web.StaticFS, "static")
 	if err != nil {
@@ -46,7 +60,8 @@ func main() {
 
 	mux := http.NewServeMux()
 	mux.Handle("GET /static/", http.StripPrefix("/static/", http.FileServer(http.FS(staticSub))))
-	mux.Handle("GET /health", http.HandlerFunc(handlers.Health))
+	mux.HandleFunc("GET /health", health.Health)
+	mux.HandleFunc("GET /version", health.Version)
 	mux.Handle("GET /", home)
 
 	srv := &http.Server{