feat: 信息架构重组 + 变更追踪 + 图片预览增强

- 信息架构重组: 周报精简为拜访+纪要两个Tab，工作计划/商机/要客独立为侧边栏「工作」分组下的独立页面
- 侧边栏分组: 汇总/工作/管理三层分组，仪表盘四卡可点击跳转
- 变更追踪(edit_log): 5张表新增JSONB edit_log列，POST创建/PUT diff自动记录，编辑弹窗变更时间轴，表格🕐编辑标记
- 图片预览增强: ImagePreview统一组件，支持适应页面/缩放/拖拽平移/滚轮缩放/键盘快捷键
- 修复客户导入500错误(errors变量未初始化)
- 移除工作计划/商机/要客页面冗余编辑按钮

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

backend/app/models/daily_note.py

@@ -2,7 +2,7 @@ import uuid
 from datetime import date, datetime
 from sqlalchemy import String, Text, Date, DateTime, ForeignKey, func
 from sqlalchemy.orm import Mapped, mapped_column
-from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.dialects.postgresql import UUID, JSONB
 from app.database import Base
 
 
@@ -15,5 +15,6 @@ class DailyNote(Base):
     category: Mapped[str] = mapped_column(String(20), default="其他")  # 行政事务/合同整理/发票处理/内部会议/培训学习/其他
     content: Mapped[str] = mapped_column(Text, default="")
     time_range: Mapped[str] = mapped_column(String(30), default="")
+    edit_log: Mapped[list] = mapped_column(JSONB, default=list)
     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())

backend/app/models/key_visit.py

@@ -1,7 +1,7 @@
 import uuid
 from sqlalchemy import String, Text, ForeignKey
 from sqlalchemy.orm import Mapped, mapped_column
-from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.dialects.postgresql import UUID, JSONB
 from app.database import Base
 
 
@@ -17,3 +17,4 @@ class KeyVisit(Base):
     planned_visitor: Mapped[str] = mapped_column(String(100), default="")
     visit_target: Mapped[str] = mapped_column(String(100), default="")
     manager_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), index=True)
+    edit_log: Mapped[list] = mapped_column(JSONB, default=list)

backend/app/models/mini_business.py

@@ -1,7 +1,7 @@
 import uuid
 from sqlalchemy import String, Text, ForeignKey
 from sqlalchemy.orm import Mapped, mapped_column
-from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.dialects.postgresql import UUID, JSONB
 from app.database import Base
 
 
@@ -16,3 +16,4 @@ class MiniBusiness(Base):
     status: Mapped[str] = mapped_column(String(50), default="跟进中")
     manager_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), index=True)
     expected_revenue_date: Mapped[str] = mapped_column(String(50), default="")
+    edit_log: Mapped[list] = mapped_column(JSONB, default=list)

backend/app/models/visit.py

@@ -2,7 +2,7 @@ import uuid
 from datetime import datetime, date
 from sqlalchemy import String, Text, Date, DateTime, ForeignKey, func
 from sqlalchemy.orm import Mapped, mapped_column
-from sqlalchemy.dialects.postgresql import UUID, ARRAY
+from sqlalchemy.dialects.postgresql import UUID, ARRAY, JSONB
 from app.database import Base
 
 
@@ -21,5 +21,6 @@ class Visit(Base):
     companions: Mapped[list | None] = mapped_column(ARRAY(UUID(as_uuid=True)), nullable=True)
     photos: Mapped[list | None] = mapped_column(ARRAY(Text), nullable=True)
     manager_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), index=True)
+    edit_log: Mapped[list] = mapped_column(JSONB, default=list)
     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())

backend/app/models/work_plan.py

@@ -2,7 +2,7 @@ import uuid
 from datetime import date
 from sqlalchemy import String, Text, Date, ForeignKey
 from sqlalchemy.orm import Mapped, mapped_column
-from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.dialects.postgresql import UUID, JSONB
 from app.database import Base
 
 
@@ -15,3 +15,4 @@ class WorkPlan(Base):
     plan_date: Mapped[date] = mapped_column(Date, index=True)
     manager_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), index=True)
     status: Mapped[str] = mapped_column(String(20), default="计划中")  # 计划中/已完成/已取消
+    edit_log: Mapped[list] = mapped_column(JSONB, default=list)