fix: Day2就绪 — 删除硬化+索引补全+全局异常处理

## base_service.py — MaterialBase删除硬化
- 新增 BomTable 引用检查(bom_usage_count)
- 物料被BOM引用时禁止删除,提示「请先解除BOM绑定」

## models/base.py + bom.py — 缺失索引补全
- material_base: company_name + is_enabled 添加 index=True
- bom_table: is_enabled 添加 index=True

## __init__.py — 全局异常处理
- @app.errorhandler(ValueError) → 400 + 自定义消息
- @app.errorhandler(404/405) → 标准错误
- @app.errorhandler(Exception) → 500 + 通用消息
  堆栈仅记录服务器日志,不泄露到前端

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

@@ -7,6 +7,7 @@ from app.models.inbound.buy import StockBuy
 from app.models.inbound.semi import StockSemi
 from app.models.inbound.product import StockProduct
 # from app.models.inbound.service import StockService
+from app.models.bom import BomTable
 from sqlalchemy import or_, and_, func, case, desc, asc, cast, Numeric, text
 import traceback
 import json
@@ -746,8 +747,11 @@ class MaterialBaseService:
             buy_usage_count = StockBuy.query.filter_by(base_id=m_id).count()
             semi_usage_count = StockSemi.query.filter_by(base_id=m_id).count()
             prod_usage_count = StockProduct.query.filter_by(base_id=m_id).count()
+            bom_usage_count = BomTable.query.filter(
+                or_(BomTable.parent_id == m_id, BomTable.child_id == m_id)
+            ).count()
 
-            total_usage = buy_usage_count + semi_usage_count + prod_usage_count
+            total_usage = buy_usage_count + semi_usage_count + prod_usage_count + bom_usage_count
 
             if total_usage > 0:
                 raise ValueError(
@@ -755,7 +759,8 @@ class MaterialBaseService:
                     f"- 采购库存记录: {buy_usage_count} 条\n"
                     f"- 半成品库存记录: {semi_usage_count} 条\n"
                     f"- 成品库存记录: {prod_usage_count} 条\n"
-                    f"请先清理相关库存或仅‘禁用’此条目。"
+                    f"- BOM配方引用: {bom_usage_count} 条\n"
+                    f"请先清理相关库存/BOM绑定或仅「禁用」此条目。"
                 )
 
             # 删除时同步清理向量记录