Enhance sales schemas with synchronization fields

- Added `syncHash`, `syncImageHash`, and `marketplaceImageUrls` fields to the `listing`, `listingVariant`, and `marketplaceMapping` schemas to support improved synchronization and image management across marketplaces.

src/database/schemas/sales/listing.schema.js

@@ -42,6 +42,9 @@ const listingSchema = new Schema(
     price: { type: Number, required: false },
     currency: { type: String, required: false },
     lastSyncedAt: { type: Date, required: false },
+    syncHash: { type: String, required: false },
+    syncImageHash: { type: String, required: false },
+    marketplaceImageUrls: [{ type: String, required: false }],
     stockQuantity: { type: Number, required: false, default: 0 },
     condition: {
       type: String,

src/database/schemas/sales/listingvarient.schema.js

@@ -47,6 +47,9 @@ const listingVarientSchema = new Schema(
     priceTaxRate: { type: Schema.Types.ObjectId, ref: 'taxRate', required: false },
     priceWithTax: { type: Number, required: false },
     lastSyncedAt: { type: Date, required: false },
+    syncHash: { type: String, required: false },
+    syncImageHash: { type: String, required: false },
+    marketplaceImageUrls: [{ type: String, required: false }],
     listingImages: [{ type: Schema.Types.ObjectId, ref: 'file', required: false }],
     stockQuantity: { type: Number, required: false, default: 0 },
   },

src/database/schemas/sales/marketplaceMapping.schema.js

@@ -9,6 +9,7 @@ export function marketplaceSyncMappingSchema() {
     {
       marketplace: { type: Schema.Types.ObjectId, ref: 'marketplace', required: true },
       externalReference: { type: String, required: false },
+      syncHash: { type: String, required: false },
       state: {
         type: {
           type: String,