refactor(task): 重构经销商订单结算任务中的上级用户查找逻辑

- 引入 UpstreamUserFinder 工具类来统一处理向上游用户链路的遍历逻辑
- 添加缓存机制减少数据库查询次数，提高性能
- 修改 settleOneOrder 方法签名以传递缓存对象
- 更新门店分红上级查找逻辑，从简单的链路取前两级改为精确查找门店角色用户
- 删除废弃的 ShopOrderSettlement10584Task 临时排查任务类
- 添加 UpstreamUserFinder 的单元测试确保逻辑正确性

src/test/java/com/gxwebsoft/shop/util/UpstreamUserFinderTest.java

@@ -0,0 +1,65 @@
+package com.gxwebsoft.shop.util;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.function.Function;
+import java.util.function.Predicate;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class UpstreamUserFinderTest {
+
+    @Test
+    void findFirstNMatchingUpstreamUsers_skipsNonMatchingAndKeepsOrder() {
+        // 100 -> 101 -> 102 -> 103 -> null
+        Map<Integer, Integer> parent = Map.of(
+            100, 101,
+            101, 102,
+            102, 103
+        );
+        Set<Integer> shopRoleUsers = Set.of(102, 103);
+
+        Function<Integer, Integer> parentResolver = parent::get;
+        Predicate<Integer> matcher = shopRoleUsers::contains;
+
+        List<Integer> got = UpstreamUserFinder.findFirstNMatchingUpstreamUsers(100, 2, 20, parentResolver, matcher);
+        assertEquals(List.of(102, 103), got);
+    }
+
+    @Test
+    void findFirstNMatchingUpstreamUsers_returnsSingleWhenOnlyOneMatchExists() {
+        // 200 -> 201 -> 202 -> null
+        Map<Integer, Integer> parent = Map.of(
+            200, 201,
+            201, 202
+        );
+        Set<Integer> shopRoleUsers = Set.of(201);
+
+        List<Integer> got = UpstreamUserFinder.findFirstNMatchingUpstreamUsers(200, 2, 20, parent::get, shopRoleUsers::contains);
+        assertEquals(List.of(201), got);
+    }
+
+    @Test
+    void findFirstNMatchingUpstreamUsers_stopsOnCycle() {
+        // 300 -> 301 -> 302 -> 301 (cycle)
+        Map<Integer, Integer> parent = Map.of(
+            300, 301,
+            301, 302,
+            302, 301
+        );
+        Set<Integer> shopRoleUsers = Set.of(301, 302);
+
+        List<Integer> got = UpstreamUserFinder.findFirstNMatchingUpstreamUsers(300, 2, 20, parent::get, shopRoleUsers::contains);
+        assertEquals(List.of(301, 302), got);
+    }
+
+    @Test
+    void findFirstNMatchingUpstreamUsers_returnsEmptyForNullStart() {
+        List<Integer> got = UpstreamUserFinder.findFirstNMatchingUpstreamUsers(null, 2, 20, x -> null, x -> true);
+        assertEquals(List.of(), got);
+    }
+}
+