feat: fulfillment modes, MQ, admin status, docs; scrub compose secrets

Made-with: Cursor

mengyastore-backend-go/internal/models/product.go

@@ -20,6 +20,8 @@ type Product struct {
 	MaxPerAccount   int       `json:"maxPerAccount"`
 	TotalSold       int       `json:"totalSold"`
 	DeliveryMode    string    `json:"deliveryMode"`
+	FulfillmentType string    `json:"fulfillmentType"`
+	FixedContent    string    `json:"fixedContent"`
 	ShowNote        bool      `json:"showNote"`
 	ShowContact     bool      `json:"showContact"`
 	CreatedAt       time.Time `json:"createdAt"`