Refactor stock transfer schema to improve location management

- Removed the `toStockLocation` field from the `stockTransferLineSchema` to streamline the schema.
- Introduced `fromLocation` and `toLocation` fields in the `stockTransferSchema` for better clarity in stock transfer processes.
- Updated the text index to focus on `state.type` for improved search capabilities.

src/database/schemas/inventory/stocktransfer.schema.js

@@ -15,11 +15,6 @@ const stockTransferLineSchema = new Schema(
       required: true,
     },
     quantity: { type: Number, required: true },
-    toStockLocation: {
-      type: Schema.Types.ObjectId,
-      ref: 'stockLocation',
-      required: true,
-    },
     toStockType: {
       type: String,
       required: false,
@@ -37,18 +32,27 @@ const stockTransferLineSchema = new Schema(
 const stockTransferSchema = new Schema(
   {
     _reference: { type: String, default: () => generateId()() },
-    name: { type: String, required: true },
     state: {
       type: { type: String, required: true, default: 'draft' },
       progress: { type: Number, required: false },
     },
     postedAt: { type: Date, required: false },
+    fromLocation: {
+      type: Schema.Types.ObjectId,
+      ref: 'stockLocation',
+      required: true,
+    },
+    toLocation: {
+      type: Schema.Types.ObjectId,
+      ref: 'stockLocation',
+      required: true,
+    },
     lines: { type: [stockTransferLineSchema], default: [] },
   },
   { timestamps: true }
 );
 
-stockTransferSchema.index({ name: 'text' });
+stockTransferSchema.index({ 'state.type': 'text' });
 
 stockTransferSchema.statics.stats = async function () {
   const [draft, posted] = await Promise.all([