fix: return A0404 for missing PDA pallets

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

@@ -110,6 +110,7 @@ paths:
       requestBody: { required: true, content: { application/json: { schema: { $ref: '#/components/schemas/InventoryMove' } } } }
       responses:
         '200': { description: 移库结果, content: { application/json: { schema: { $ref: '#/components/schemas/InventoryMoveResponse' } } } }
+        '404': { description: 来源托盘不存在（统一响应实际 HTTP 200，body.code=A0404）, content: { application/json: { schema: { $ref: '#/components/schemas/ApiResponse' } } } }
         '409': { description: 跨仓、资源或库存版本冲突 }
   /api/pda/v1/last-leg/inventory/resolve:
     post:
@@ -130,6 +131,7 @@ paths:
       requestBody: { required: true, content: { application/json: { schema: { $ref: '#/components/schemas/ScanCode' } } } }
       responses:
         '200': { description: 托盘及其库存内容, content: { application/json: { schema: { $ref: '#/components/schemas/PalletResponse' } } } }
+        '404': { description: 托盘不存在（统一响应实际 HTTP 200，body.code=A0404）, content: { application/json: { schema: { $ref: '#/components/schemas/ApiResponse' } } } }
   /api/pda/v1/last-leg/operations:
     get:
       summary: 查询当前操作人的仓内操作历史
@@ -143,7 +145,7 @@ paths:
     post:
       summary: 扫码查询托盘及库存内容
       requestBody: { required: true, content: { application/json: { schema: { $ref: '#/components/schemas/ScanCode' } } } }
-      responses: { '200': { description: Token绑定仓托盘内容 } }
+      responses: { '200': { description: Token绑定仓托盘内容 }, '404': { description: 托盘不存在（统一响应实际 HTTP 200，body.code=A0404）, content: { application/json: { schema: { $ref: '#/components/schemas/ApiResponse' } } } } }
   /api/pda/v1/last-leg/pallet-operations/assemble:
     post:
       summary: 将多个来源托盘的指定库存行组到目标托盘