perf: 引入 Redis Cache-Aside 模式优化 BOM 读取，TTL=12h，写操作后主动失效缓存

inventory-backend/app/api/v1/bom.py

@@ -1,6 +1,6 @@
 from flask import Blueprint, request, jsonify, current_app
 from sqlalchemy import or_
-from app.services.bom_service import BomService
+from app.services.bom_service import BomService, _cache_delete
 from app.models.base import MaterialBase
 from app.models.bom import BomTable
 from app.extensions import db
@@ -225,6 +225,11 @@ def delete_bom(bom_no):
             db.session.delete(rec)
 
         db.session.commit()
+
+        # ===== 删除成功后立刻清除缓存（Cache Invalidation） =====
+        _cache_delete(bom_no, version)
+        current_app.logger.info(f"[BOM Cache] delete_bom → 缓存已失效 bom_no={bom_no} version={version}")
+
         return jsonify({
             'code': 200,
             'msg': '删除成功',