feat(backend): 新增 /dashboard/user-operations 人员操作统计接口

- add_task_record 补 action_type=record 日志，使上传备注可统计到人
- get_user_operations 按人聚合 接收(receive)/转交(complete)/上传备注(record) 次数，时间筛选，中文名映射
- 复用 get_display_names，不新增数据库字段

backend/app/services/dashboard_service.py

@@ -63,6 +63,15 @@ class RejectedTask(BaseModel):
     rejected_at: str | None      # 驳回时间 ISO（BEIJING_TZ）
 
 
+class UserOperation(BaseModel):
+    user_id: str                 # 登录名 username
+    user_name: str               # 中文姓名
+    receive_count: int = 0       # 接收次数
+    transfer_count: int = 0      # 转交次数（action=complete）
+    record_count: int = 0        # 上传备注次数（action=record）
+    total: int = 0               # 总操作次数
+
+
 class PersonDevice(BaseModel):
     product_id: str
     serial_number: str           # 16位HEX身份证
@@ -465,6 +474,68 @@ async def get_rejected_tasks(
     return items
 
 
+# ============================================================
+# 人员操作统计（接收/转交/上传备注 — 按人聚合，时间可筛选）
+# ============================================================
+
+async def get_user_operations(
+    db: AsyncSession,
+    since: datetime | None = None,
+    until: datetime | None = None,
+) -> list[UserOperation]:
+    """上帝视角 — 统计每个人员的操作次数（按时段过滤 task_logs）。
+
+    操作口径：
+      - 接收: action_type='receive'
+      - 转交: action_type='complete'（完工并移交下一道工序）
+      - 上传备注: action_type='record'（工人手动追加的进度记录）
+    """
+    from app.models.task_log import TaskLog
+
+    rcv = func.count().filter(TaskLog.action_type == "receive")
+    cpl = func.count().filter(TaskLog.action_type == "complete")
+    rcd = func.count().filter(TaskLog.action_type == "record")
+    total_expr = rcv + cpl + rcd
+
+    stmt = (
+        select(TaskLog.operator_id, rcv.label("receive"), cpl.label("complete"), rcd.label("record"))
+        .where(
+            TaskLog.action_type.in_(["receive", "complete", "record"]),
+            TaskLog.operator_id.isnot(None),
+        )
+        .group_by(TaskLog.operator_id)
+        .order_by(total_expr.desc())
+    )
+    if since:
+        stmt = stmt.where(TaskLog.created_at >= since)
+    if until:
+        stmt = stmt.where(TaskLog.created_at <= until)
+
+    result = await db.execute(stmt)
+    rows = result.all()
+
+    ids = [r[0] for r in rows if r[0]]
+    name_map: dict[str, str] = {}
+    if ids:
+        from app.services.mom_cache import get_display_names
+        name_map = get_display_names(ids)
+
+    items: list[UserOperation] = []
+    for row in rows:
+        receive = row[1] or 0
+        transfer = row[2] or 0
+        record = row[3] or 0
+        items.append(UserOperation(
+            user_id=row[0],
+            user_name=name_map.get(row[0], row[0]),
+            receive_count=receive,
+            transfer_count=transfer,
+            record_count=record,
+            total=receive + transfer + record,
+        ))
+    return items
+
+
 # ============================================================
 # 人员负载（按人聚合在制品设备 — 独立「人员看板」）
 # ============================================================

backend/app/services/task_service.py

@@ -1049,6 +1049,16 @@ async def add_task_record(
     db.add(record)
     await db.flush()
 
+    # 🔧 操作日志：记录一次「上传备注」操作（供人员操作统计）
+    if current_user:
+        from app.models.task_log import TaskLog
+        db.add(TaskLog(
+            task_id=task_id,
+            operator_id=current_user.get("username") or current_user.get("sub") or "",
+            action_type="record",
+            remark=f"上传备注: {(data.remark or '')[:100]}",
+        ))
+
     # 🚀 留言通知：给任务当前负责人发送提醒（不给自己发）
     if (
         current_user