feat&fix: 完善半成品/序列号闭环流转逻辑

1. 调整物料编码字段为可空，优化注释说明
2. 修复Vite构建自动清空产物目录冲突问题
3. 优化前端提示文案与表单占位符
4. 为各前端项目添加内联SVG图标
5. 重构MES半成品流转逻辑，不再静默吞掉WMS错误并记录日志
6. 生成并添加空的WMS客户端静态文件
7. 完善Ent ORM模型的空值支持与查询谓词
8. 优化半成品入库接口，支持doneProcessCodes数组格式，新增SN反查物料编码逻辑
9. 更新帮助文档与操作手册

bj_power_wms/ent/migrate/schema.go

@@ -373,7 +373,7 @@ var (
 	SemiFinishedsColumns = []*schema.Column{
 		{Name: "id", Type: field.TypeInt, Increment: true},
 		{Name: "sn", Type: field.TypeString, Unique: true},
-		{Name: "material_code", Type: field.TypeString},
+		{Name: "material_code", Type: field.TypeString, Nullable: true},
 		{Name: "completed_process", Type: field.TypeString, Nullable: true},
 		{Name: "quantity", Type: field.TypeInt, Default: 1},
 		{Name: "zone_code", Type: field.TypeString, Nullable: true},
@@ -404,7 +404,7 @@ var (
 	SerialNumbersColumns = []*schema.Column{
 		{Name: "id", Type: field.TypeInt, Increment: true},
 		{Name: "sn_code", Type: field.TypeString, Unique: true},
-		{Name: "material_code", Type: field.TypeString},
+		{Name: "material_code", Type: field.TypeString, Nullable: true},
 		{Name: "batch_no", Type: field.TypeString, Nullable: true},
 		{Name: "status", Type: field.TypeString, Default: "在库"},
 		{Name: "current_zone", Type: field.TypeString, Nullable: true},