Add vendor workspace import and pricing export workflow

internal/repository/partnumber_book.go

@@ -31,6 +31,35 @@ func (r *PartnumberBookRepository) GetBookItems(bookID uint) ([]localdb.LocalPar
 	return items, err
 }
 
+// GetBookItemsPage returns items for the given local book ID with optional search and pagination.
+func (r *PartnumberBookRepository) GetBookItemsPage(bookID uint, search string, page, perPage int) ([]localdb.LocalPartnumberBookItem, int64, error) {
+	if page < 1 {
+		page = 1
+	}
+	if perPage < 1 {
+		perPage = 100
+	}
+
+	query := r.db.Model(&localdb.LocalPartnumberBookItem{}).Where("book_id = ?", bookID)
+	trimmedSearch := "%" + search + "%"
+	if search != "" {
+		query = query.Where("partnumber LIKE ? OR lot_name LIKE ?", trimmedSearch, trimmedSearch)
+	}
+
+	var total int64
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	var items []localdb.LocalPartnumberBookItem
+	err := query.
+		Order("partnumber ASC, lot_name ASC, id ASC").
+		Offset((page - 1) * perPage).
+		Limit(perPage).
+		Find(&items).Error
+	return items, total, err
+}
+
 // FindLotByPartnumber looks up a partnumber in the active book and returns the matching items.
 func (r *PartnumberBookRepository) FindLotByPartnumber(bookID uint, partnumber string) ([]localdb.LocalPartnumberBookItem, error) {
 	var items []localdb.LocalPartnumberBookItem
@@ -64,3 +93,20 @@ func (r *PartnumberBookRepository) CountBookItems(bookID uint) int64 {
 	r.db.Model(&localdb.LocalPartnumberBookItem{}).Where("book_id = ?", bookID).Count(&count)
 	return count
 }
+
+func (r *PartnumberBookRepository) CountDistinctLots(bookID uint) int64 {
+	var count int64
+	r.db.Model(&localdb.LocalPartnumberBookItem{}).
+		Where("book_id = ?", bookID).
+		Distinct("lot_name").
+		Count(&count)
+	return count
+}
+
+func (r *PartnumberBookRepository) CountPrimaryItems(bookID uint) int64 {
+	var count int64
+	r.db.Model(&localdb.LocalPartnumberBookItem{}).
+		Where("book_id = ? AND is_primary_pn = ?", bookID, true).
+		Count(&count)
+	return count
+}