feat(backend): 出入库编码搜索双路匹配+建单填快照；finance 趋势/日期区间；partner/product 拼音搜索

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJ1g8XV1YhhmHRzhwWEW7o

backend/internal/handler/product.go

@@ -39,8 +39,11 @@ func (h *ProductHandler) List(c *gin.Context) {
 		Where("shop_id = ? AND deleted_at IS NULL", shopID)
 
 	if keyword != "" {
-		query = query.Where("name LIKE ? OR code LIKE ? OR barcode LIKE ?",
-			"%"+keyword+"%", "%"+keyword+"%", "%"+keyword+"%")
+		// 原型搜索口径：商品名 / 拼音（全拼+首字母）/ 编码；barcode 保留兼容
+		like := "%" + keyword + "%"
+		query = query.Where(
+			"name LIKE ? OR code LIKE ? OR barcode LIKE ? OR name_pinyin LIKE ? OR name_initials LIKE ?",
+			like, like, like, like, like)
 	}
 	if categoryID != "" {
 		query = query.Where("category_id = ?", categoryID)