半成品/成品入库：BOM 编号下拉按父件规格联动过滤（前后端双端改造）

- 后端 /inbound/{semi,product}/search-bom 增加 parent_spec 可选参数，Service 层在 MaterialBase.spec_model 上加等值过滤

inventory-backend/app/services/inbound/semi_service.py

@@ -71,7 +71,7 @@ class SemiInboundService:
             return {"items": [], "total": 0, "page": 1, "has_next": False}
 
     @staticmethod
-    def search_bom_options(keyword):
+    def search_bom_options(keyword, parent_spec=None):
         from app.models.bom import BomTable
         try:
             query = db.session.query(
@@ -84,6 +84,9 @@ class SemiInboundService:
             if hasattr(BomTable, 'is_enabled'):
                 query = query.filter(BomTable.is_enabled == True)
 
+            if parent_spec:
+                query = query.filter(MaterialBase.spec_model == parent_spec)
+
             if keyword:
                 kw = f'%{keyword}%'
                 query = query.filter(