feat: 三项改进 — require_report + 拜访联动 + 解绑移到弹窗

1. 用户管理页 UX 优化:
   - 表格内「解绑」按钮移入编辑弹窗(clearable 输入框)
   - 新增「需要填写周报」el-switch 开关
   - 新增「填报」列显示是否计入统计

2. require_report 字段 (DB + API + 联动):
   - users 表新增 require_report BOOLEAN DEFAULT TRUE
   - 调度器/仪表盘进度/立即检查 均排除 require_report=false
   - UserOut schema + UpdateUserRoleRequest 同步更新

3. 拜访联动客户 last_visit:
   - customers 表新增 last_visit_date / last_visit_manager_id
   - 创建拜访记录时自动更新对应客户的最后拜访信息
   - 亮灯表可据此精确判断客户拜访状态

Co-Authored-By: Claude <noreply@anthropic.com>

backend/app/models/customer.py

@@ -1,6 +1,6 @@
 import uuid
-from datetime import datetime
-from sqlalchemy import String, Text, DateTime, func, ForeignKey
+from datetime import date, datetime
+from sqlalchemy import String, Text, Date, DateTime, Boolean, func, ForeignKey
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 from sqlalchemy.dialects.postgresql import UUID
 from app.database import Base
@@ -19,6 +19,8 @@ class Customer(Base):
     created_by: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"))
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
     updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+    last_visit_date: Mapped[date | None] = mapped_column(Date, nullable=True)
+    last_visit_manager_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
 
     contacts: Mapped[list["CustomerContact"]] = relationship("CustomerContact", back_populates="customer", cascade="all, delete-orphan")
     assignments: Mapped[list["CustomerAssignment"]] = relationship("CustomerAssignment", back_populates="customer", cascade="all, delete-orphan")