feat: 采购申请新增库管'完结'功能(仿出库审批)

- 后端:approve 接口支持 action=close(已通过→已完结 status 1→4),模型 status_text 支持已完结
- 前端:采购申请状态tab加'已完结',已通过单显示'完结'按钮(库管)

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

@@ -206,7 +206,7 @@ def approve_purchase_request(purchase_id):
         action = data.get('action', 'approve')
         reject_reason = data.get('reject_reason')
 
-        if action not in ('approve', 'reject'):
+        if action not in ('approve', 'reject', 'close'):
             return jsonify({'code': 400, 'msg': '无效的审批操作'}), 400
 
         if action == 'reject' and not reject_reason:
@@ -219,7 +219,7 @@ def approve_purchase_request(purchase_id):
             reject_reason=reject_reason
         )
 
-        msg = '审批通过' if action == 'approve' else '已驳回'
+        msg = '审批通过' if action == 'approve' else ('已驳回' if action == 'reject' else '已完结')
         # ★ Fail-Closed: 审批响应剥离价格字段
         resp = purchase.to_dict()
         for k in ('unit_price', 'total_price', 'tax_rate'):

inventory-backend/app/models/purchase.py

@@ -91,7 +91,7 @@ class PurchaseRequest(db.Model):
             'total_price': float(self.total_price) if self.total_price else 0,
             'tax_rate': float(self.tax_rate) if self.tax_rate else 0,
             'status': self.status,
-            'status_text': ['待审批', '已通过', '已驳回', '已完成'][self.status] if self.status in [0, 1, 2, 3] else '未知',
+            'status_text': ['待审批', '已通过', '已驳回', '已完成', '已完结'][self.status] if self.status in [0, 1, 2, 3, 4] else '未知',
             'requester_id': self.requester_id,
             'requester_name': self._get_user_name(self.requester_id),
             'requester_email': self._get_user_email(self.requester_id),

inventory-backend/app/services/purchase_service.py

@@ -145,12 +145,22 @@ class PurchaseService:
         if not purchase:
             raise ValueError("采购申请不存在")
 
-        if purchase.status != 0:
-            raise ValueError("当前状态不允许审批")
-
         beijing_tz = timezone(timedelta(hours=8))
         now = datetime.now(beijing_tz)
 
+        # ★ 完结：库管将「已通过(1)」的申请单置为「已完结(4)」（仿出库审批）
+        if action == 'close':
+            if purchase.status != 1:
+                raise ValueError("仅「已通过」的采购申请可完结")
+            purchase.status = 4
+            purchase.approver_id = user_id
+            purchase.approved_at = now
+            db.session.commit()
+            return purchase
+
+        if purchase.status != 0:
+            raise ValueError("当前状态不允许审批")
+
         if action == 'approve':
             purchase.status = 1
             purchase.approver_id = user_id