feat: 任务全景表格新增"最新动态"列

后端:
  - ProductResponse 新增 latest_record_time/content 字段
  - get_all_products 批量查询活跃任务(WIP/PENDING)的最新 task_records
  - 使用窗口函数 ROW_NUMBER() PARTITION BY product_id

前端:
  - AdminTasksPage: grid-cols-12→grid-cols-[14]
  - 表头+数据行新增"最新动态"列
  - Tooltip悬浮显示完整内容, 截断+灰字二级排版

backend/app/services/product_service.py

@@ -461,6 +461,32 @@ async def get_all_products(
     merged_location_ids = list(set(static_location_ids + dynamic_location_ids))
     merged_name_map = _lookup_display_names(merged_location_ids)
 
+    # 🔧 批量查询每个产品活跃任务的最新记录
+    latest_record_map: dict[uuid.UUID, tuple] = {}
+    if product_ids:
+        from app.models.task import TaskRecord as TR
+        wip_pending_ids = select(Task.id).where(
+            and_(
+                Task.product_id.in_(product_ids),
+                Task.status.in_(["WIP", "PENDING"]),
+            )
+        ).subquery()
+        ranked = (
+            select(TR.task_id, TR.remark, TR.created_at, Task.product_id,
+                   func.row_number().over(
+                       partition_by=Task.product_id,
+                       order_by=TR.created_at.desc()
+                   ).label("rn"))
+            .join(Task, TR.task_id == Task.id)
+            .where(Task.id.in_(select(wip_pending_ids.c.id)))
+        ).subquery()
+        rec_result = await db.execute(
+            select(ranked.c.product_id, ranked.c.created_at, ranked.c.remark)
+            .where(ranked.c.rn == 1)
+        )
+        for row in rec_result:
+            latest_record_map[row[0]] = (row[1], row[2])
+
     return [
         ProductResponse(
             id=p.id,
@@ -474,10 +500,8 @@ async def get_all_products(
             category=p.category,
             material_type=p.material_type,
             parent_product_id=p.parent_product_id,
-            # 🔧 当前位置：动态主干assignee优先 → 静态兜底
             current_location_id=(
-                main_assignees.get(p.id)  # 动态主干
-                or p.current_location_id  # 静态兜底
+                main_assignees.get(p.id) or p.current_location_id
             ),
             current_location_name=(
                 "仓库" if (main_assignees.get(p.id) or p.current_location_id) == "virtual_warehouse"
@@ -489,6 +513,8 @@ async def get_all_products(
             overall_status=overall_names.get(p.id) or p.overall_status,
             status=p.status,
             created_at=p.created_at,
+            latest_record_time=latest_record_map.get(p.id, (None, None))[0],
+            latest_record_content=latest_record_map.get(p.id, (None, None))[1],
         )
         for p in products
     ]