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/check/main.go

@@ -0,0 +1,148 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"shop/internal/check"
+)
+
+func main() {
+	loadDotEnv()
+
+	ctx := context.Background()
+	report := check.AppInfo()
+	report.Items = append(report.Items, check.ToolVersions(ctx)...)
+
+	dbURL := os.Getenv("DATABASE_URL")
+	if dbURL == "" {
+		report.Items = append(report.Items, check.Item{
+			Name:   "database",
+			Status: check.StatusWarn,
+			Detail: "DATABASE_URL не задан — запустите: go run ./cmd/install",
+		})
+	} else {
+		pool, err := pgxpool.New(ctx, dbURL)
+		if err != nil {
+			report.Items = append(report.Items, check.Item{
+				Name:   "database",
+				Status: check.StatusError,
+				Detail: err.Error(),
+			})
+		} else {
+			defer pool.Close()
+			dbItems, err := check.Database(ctx, pool)
+			if err != nil {
+				report.Items = append(report.Items, check.Item{
+					Name:   "database",
+					Status: check.StatusError,
+					Detail: err.Error(),
+				})
+			} else {
+				report.Items = append(report.Items, dbItems...)
+			}
+		}
+	}
+
+	enc := json.NewEncoder(os.Stdout)
+	enc.SetIndent("", "  ")
+	_ = enc.Encode(report)
+
+	fmt.Println()
+	printSummary(report)
+
+	if !report.Healthy() {
+		os.Exit(1)
+	}
+}
+
+func printSummary(r check.Report) {
+	fmt.Printf("ShopNova %s | %s\n\n", r.AppVersion, r.GoVersion)
+	for _, it := range r.Items {
+		mark := "✓"
+		switch it.Status {
+		case check.StatusWarn:
+			mark = "!"
+		case check.StatusError:
+			mark = "✗"
+		}
+		line := fmt.Sprintf("  %s %-18s %s", mark, it.Name+":", it.Detail)
+		if it.Expected != "" {
+			line += " (ожидается " + it.Expected + ")"
+		}
+		fmt.Println(line)
+	}
+}
+
+func loadDotEnv() {
+	root, _ := os.Getwd()
+	path := filepath.Join(root, ".env")
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return
+	}
+	for _, line := range splitLines(string(data)) {
+		line = trimComment(line)
+		if line == "" {
+			continue
+		}
+		k, v, ok := splitKV(line)
+		if !ok {
+			continue
+		}
+		if os.Getenv(k) == "" {
+			_ = os.Setenv(k, v)
+		}
+	}
+}
+
+func splitLines(s string) []string {
+	var lines []string
+	start := 0
+	for i := 0; i < len(s); i++ {
+		if s[i] == '\n' {
+			lines = append(lines, s[start:i])
+			start = i + 1
+		}
+	}
+	if start < len(s) {
+		lines = append(lines, s[start:])
+	}
+	return lines
+}
+
+func trimComment(s string) string {
+	if i := indexByte(s, '#'); i >= 0 {
+		s = s[:i]
+	}
+	for len(s) > 0 && (s[len(s)-1] == ' ' || s[len(s)-1] == '\r') {
+		s = s[:len(s)-1]
+	}
+	for len(s) > 0 && s[0] == ' ' {
+		s = s[1:]
+	}
+	return s
+}
+
+func splitKV(s string) (string, string, bool) {
+	for i := 0; i < len(s); i++ {
+		if s[i] == '=' {
+			return s[:i], s[i+1:], true
+		}
+	}
+	return "", "", false
+}
+
+func indexByte(s string, c byte) int {
+	for i := 0; i < len(s); i++ {
+		if s[i] == c {
+			return i
+		}
+	}
+	return -1
+}