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>

internal/handlers/health.go

@@ -0,0 +1,57 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"shop/internal/check"
+)
+
+type HealthHandler struct {
+	pool *pgxpool.Pool
+}
+
+func NewHealthHandler(pool *pgxpool.Pool) *HealthHandler {
+	return &HealthHandler{pool: pool}
+}
+
+func (h *HealthHandler) Health(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	report, err := check.WithDatabase(ctx, h.pool)
+	if err != nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]any{
+			"status":  "error",
+			"error":   err.Error(),
+			"version": report.AppVersion,
+		})
+		return
+	}
+
+	status := "ok"
+	code := http.StatusOK
+	if !report.Healthy() {
+		status = "degraded"
+		code = http.StatusServiceUnavailable
+	}
+
+	writeJSON(w, code, map[string]any{
+		"status":      status,
+		"app_version": report.AppVersion,
+		"go_version":  report.GoVersion,
+		"checks":      report.Items,
+	})
+}
+
+func (h *HealthHandler) Version(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	report, _ := check.WithDatabase(ctx, h.pool)
+	writeJSON(w, http.StatusOK, report)
+}
+
+func writeJSON(w http.ResponseWriter, code int, v any) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(code)
+	_ = json.NewEncoder(w).Encode(v)
+}