Tweak order response fields

- Change created-order status string from "created" to "order created"
- Rename receipt JSON tag to receipt_s3_ke

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: charankamarapu

producer/handlers/order.go

@@ -94,7 +94,7 @@ func (h *OrderHandler) CreateOrder(w http.ResponseWriter, r *http.Request) {
 		log.Printf("Kafka event published for order %s", order.ID)
 	}
 
-	order.Status = "created"
+	order.Status = "order created"
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusCreated)
 	json.NewEncoder(w).Encode(map[string]interface{}{

producer/models/order.go

@@ -9,7 +9,7 @@ type Order struct {
 	Quantity    int       `json:"quantity"`
 	Price       float64   `json:"price"`
 	Status      string    `json:"status"`
-	ReceiptKey  string    `json:"receipt_s3_key,omitempty"`
+	ReceiptKey  string    `json:"receipt_s3_ke,omitempty"`
 	CreatedAt   time.Time `json:"created_at"`
 	UpdatedAt   time.Time `json:"updated_at"`
 }