Add Wildberries product fetching and rate limiting functionality

internal/config/database.go

@@ -0,0 +1,23 @@
+package config
+
+import "os"
+
+type DatabaseConfig struct {
+	Host     string
+	Port     string
+	Login    string
+	Password string
+	Database string
+	URL      string
+}
+
+func LoadDatabaseConfig() *DatabaseConfig {
+	return &DatabaseConfig{
+		Host:     os.Getenv("POSTGRES_HOST"),
+		Port:     os.Getenv("POSTGRES_PORT"),
+		Login:    os.Getenv("POSTGRES_LOGIN"),
+		Password: os.Getenv("POSTGRES_PASSWORD"),
+		Database: os.Getenv("POSTGRES_DATABASE"),
+		URL:      os.Getenv("POSTGRES_URL"),
+	}
+}