feat(dispatch): paginate candidates and expose received PLAN first-pick positions

lastleg-service/src/main/resources/openapi/overseas-business-v1.yaml

@@ -888,8 +888,8 @@ paths:
         '422': { description: 排车单没有可打印的 BOL 明细 }
   /api/platform/v1/last-leg/dispatches/candidates:
     get:
-      summary: 读取真实候选及来源版本
-      description: 权限 platform:overseas-warehouse:dispatch:list。
+      summary: 分页读取真实候选及来源版本
+      description: 权限 platform:overseas-warehouse:dispatch:list。数据库按客户、订单、托盘和来源身份稳定排序分页；总数与当前页来自同一只读快照。selectionGroup仍包含完整同托及整申请来源，可包含页外成员；选取时服务端再次权威解析，不以当前页充当完整组。
       security:
       - bearerAuth: []
       responses:
@@ -947,6 +947,26 @@ paths:
         in: query
         schema:
           type: string
+      - name: page
+        in: query
+        schema:
+          type: integer
+          minimum: 1
+          default: 1
+      - name: size
+        in: query
+        schema:
+          type: integer
+          minimum: 1
+          maximum: 50
+          default: 20
+      - name: warehouseTab
+        in: query
+        description: 对起运仓名称和编码的服务端页签筛选，在统计和分页前生效。
+        schema:
+          type: string
+          enum: [ALL, LAX, NYC]
+          default: ALL
   /api/platform/v1/last-leg/dispatches/drafts/pre-arrange:
     post:
       summary: 将所有非空容器原子转换为整车
@@ -6972,6 +6992,19 @@ components:
           nullable: true
         complete:
           type: boolean
+          description: 仅当前响应包含筛选后的全部候选时为true；分页中的false不影响每个selectionGroup的完整性。
+        total:
+          type: string
+          pattern: ^[0-9]+$
+          description: 同一筛选下的来源总行数。
+        page:
+          type: integer
+        size:
+          type: integer
+        pages:
+          type: string
+          pattern: ^[0-9]+$
+      required: [candidates, snapshotAt, complete, total, page, size, pages]
     DispatchDraftContainer:
       type: object
       x-java-record: DispatchPlanningModels.DraftContainer