feat: add backend autocomplete for suppliers and users in inbound

Co-authored-by: aider (openai/DeepSeek-V3.2-Thinking) <aider@aider.chat>

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

@@ -161,4 +161,46 @@ class ServiceService:
             'total': total,
             'page': page,
             'per_page': per_page
-        }
+        }
+
+    # ============================================================
+    # 供应商历史查询
+    # ============================================================
+    @classmethod
+    def get_history_providers(cls, base_id):
+        """返回该物料关联的服务商列表（去重）"""
+        try:
+            query = db.session.query(StockService.provider_name).filter(
+                StockService.base_id == base_id,
+                StockService.provider_name.isnot(None)
+            ).distinct().order_by(StockService.provider_name)
+            providers = [row[0] for row in query.all()]
+            return providers
+        except Exception:
+            return []
+
+    # ============================================================
+    # 系统用户搜索
+    # ============================================================
+    @classmethod
+    def search_system_users(cls, keyword):
+        """搜索系统用户（活跃状态）"""
+        from app.models.system import SysUser
+        try:
+            query = SysUser.query.filter(SysUser.status == 'active')
+            if keyword:
+                kw = f'%{keyword}%'
+                query = query.filter(db.or_(
+                    SysUser.username.ilike(kw),
+                    SysUser.email.ilike(kw)
+                ))
+            query = query.order_by(SysUser.username)
+            users = []
+            for u in query.limit(20).all():
+                users.append({
+                    'value': u.username,
+                    'email': u.email
+                })
+            return users
+        except Exception:
+            return []