feat: add invoice and alternative_componen management functionality

internal/models/invoice_model.go

@@ -0,0 +1,19 @@
+package models
+
+import "time"
+
+type Invoice struct {
+	ID              int64     `json:"id"`
+	InvoiceCode     string    `json:"invoiceCode"`
+	Type            string    `json:"type"`
+	Status          string    `json:"status"`
+	InvoiceConfigID int64     `json:"invoiceConfigId"`
+	TotalItems      int32     `json:"totalItems"`
+	Note            string    `json:"note"`
+	CreatedBy       string    `json:"createdBy"`
+	ApprovedBy      string    `json:"approvedBy"`
+	CompletedAt     time.Time `json:"completedAt"`
+	CreatedAt       time.Time `json:"createdAt"`
+	UpdatedAt       time.Time `json:"updatedAt"`
+	Metadata        []byte    `json:"metadata"`
+}