feat(backend): 新增 /dashboard/user-operations/detail 操作明细下钻接口

- 按人+操作类型(receive/transfer/record)查询明细：任务/产品/备注/时间
- record 明细与该人统计口径一致(名下任务手动备注，排除系统自动)

backend/app/services/dashboard_service.py

@@ -72,6 +72,14 @@ class UserOperation(BaseModel):
     total: int = 0               # 总操作次数
 
 
+class OperationDetail(BaseModel):
+    task_name: str               # 任务/工序名
+    product_sn: str              # 产品身份证
+    material_name: str           # 设备名称
+    remark: str | None           # 备注/说明
+    time: str                    # 操作时间 ISO（BEIJING_TZ）
+
+
 class PersonDevice(BaseModel):
     product_id: str
     serial_number: str           # 16位HEX身份证
@@ -583,6 +591,90 @@ async def get_user_operations(
     return items
 
 
+# ============================================================
+# 人员操作明细（点击数字下钻 — 接收/转交/上传备注）
+# ============================================================
+
+async def get_user_operation_detail(
+    db: AsyncSession,
+    user_id: str,
+    action_type: str,
+    since: datetime | None = None,
+    until: datetime | None = None,
+) -> list[OperationDetail]:
+    """查询某人在指定时段内的某类操作明细。
+
+    action_type:
+      - receive: 接收（task_logs.action_type='receive'）
+      - transfer: 转交（task_logs.action_type='complete'）
+      - record: 上传备注（该人名下任务的手动备注，排除系统自动生成的）
+    """
+    from app.models.task_log import TaskLog
+    from app.models.task import Task, TaskRecord
+    from app.models.product import Product
+    from app.core.time_utils import BEIJING_TZ
+
+    def _to_iso(dt) -> str:
+        if not dt:
+            return ""
+        if dt.tzinfo is None:
+            from datetime import timezone as dt_timezone
+            dt = dt.replace(tzinfo=dt_timezone.utc).astimezone(BEIJING_TZ)
+        else:
+            dt = dt.astimezone(BEIJING_TZ)
+        return dt.isoformat()
+
+    items: list[OperationDetail] = []
+
+    if action_type in ("receive", "transfer"):
+        act = "receive" if action_type == "receive" else "complete"
+        stmt = (
+            select(TaskLog.created_at, Task.task_name, Product.serial_number, Product.material_name, TaskLog.remark)
+            .join(Task, TaskLog.task_id == Task.id)
+            .join(Product, Task.product_id == Product.id)
+            .where(TaskLog.operator_id == user_id, TaskLog.action_type == act)
+            .order_by(TaskLog.created_at.desc())
+        )
+        if since:
+            stmt = stmt.where(TaskLog.created_at >= since)
+        if until:
+            stmt = stmt.where(TaskLog.created_at <= until)
+        rows = (await db.execute(stmt)).all()
+        for r in rows:
+            items.append(OperationDetail(
+                task_name=r[1] or "",
+                product_sn=r[2] or "",
+                material_name=r[3] or "",
+                remark=r[4] or "",
+                time=_to_iso(r[0]),
+            ))
+    elif action_type == "record":
+        stmt = (
+            select(TaskRecord.created_at, Task.task_name, Product.serial_number, Product.material_name, TaskRecord.remark)
+            .join(Task, TaskRecord.task_id == Task.id)
+            .join(Product, Task.product_id == Product.id)
+            .where(
+                Task.assignee_id == user_id,
+                or_(TaskRecord.remark.is_(None), ~TaskRecord.remark.like("[%")),
+            )
+            .order_by(TaskRecord.created_at.desc())
+        )
+        if since:
+            stmt = stmt.where(TaskRecord.created_at >= since)
+        if until:
+            stmt = stmt.where(TaskRecord.created_at <= until)
+        rows = (await db.execute(stmt)).all()
+        for r in rows:
+            items.append(OperationDetail(
+                task_name=r[1] or "",
+                product_sn=r[2] or "",
+                material_name=r[3] or "",
+                remark=r[4] or "",
+                time=_to_iso(r[0]),
+            ))
+    return items
+
+
 # ============================================================
 # 人员负载（按人聚合在制品设备 — 独立「人员看板」）
 # ============================================================