feat: 工单列表重设计+权限组实例过滤+通知修复

后端:
- Ticket model 新增 ticket_no 字段(格式: YYYYMMDDHHmmss+ms+seq, 如20260522160543841)
- create_ticket 自动生成工单编号(flush后生成)
- _enrich_ticket 新增 instance_name, current_approver_name 字段
- current_approver: 从 ticket_approvals 查询第一个 pending 状态的审批步骤获取审核人
- TicketResponse schema 新增 ticket_no, instance_name, current_approver_name
- 新增 /instances/accessible endpoint(按用户权限组过滤实例, 无admin bypass)
- instance_group response_model 改为 InstanceGroupDetailResponse(含readonly/write实例)
- instance_group_members 脏数据清理, 重建 group_id=2 正确数据
- notification 模板修复: \n→\n 换行, 钉钉 \n→\n\n 双换行
- test_notification endpoint 改为真正调用 NotificationSender.send()
- auditor 角色添加到 audit_rule/ticket 只读端点
- seed_data() 创建4个默认用户(admin/zhangsan/laoliu/lurenjia)
- SQLite ALTER TABLE 添加 ticket_no 列, 迁移现有6条工单数据

前端:
- TicketsPage 完全重设计: 工单编号/实例名称/提交人/当前审核人/状态/操作
- 状态映射简化: pending/reviewing/approved→审核中, success→完成, failed→失败
- 执行详情弹框: 解析 execute_result JSON 展示状态/影响行数/耗时/验证/原始输出/错误信息
- 状态流程可视化(提交→审批→通过→执行→完成)
- 快速筛选: 全部/待审批/执行中/完成/失败 (合并 pending+reviewing+approved 统计)
- TicketCreatePage: 去掉数据库类型选择器, 用 accessible(write) 过滤变更实例
- QueriesPage: 用 accessible(readonly) 过滤查询实例
- instance.ts 新增 accessible 方法
- 分页优化: 动态计算页码范围(总页>5时中间滚动)

backend/app/schemas/scheduled_task.py

@@ -0,0 +1,82 @@
+"""定时任务 Schema — 基于 SQL 的自动化任务。"""
+from typing import Optional, List
+from pydantic import BaseModel, Field
+from datetime import datetime
+from enum import Enum
+
+
+class TaskSqlType(str, Enum):
+    insert = "insert"
+    update = "update"
+    delete = "delete"
+
+
+class ScheduledTaskCreate(BaseModel):
+    name: str = Field(..., min_length=1, max_length=100)
+    description: Optional[str] = None
+    task_sql_type: TaskSqlType
+    instance_id: int
+    target_db: Optional[str] = None
+    target_table: Optional[str] = None
+    sql_content: str = Field(..., min_length=1)
+    cron_expression: str = Field(..., min_length=1)
+    is_enabled: bool = True
+
+
+class ScheduledTaskUpdate(BaseModel):
+    name: Optional[str] = Field(None, min_length=1, max_length=100)
+    description: Optional[str] = None
+    task_sql_type: Optional[TaskSqlType] = None
+    instance_id: Optional[int] = None
+    target_db: Optional[str] = None
+    target_table: Optional[str] = None
+    sql_content: Optional[str] = Field(None, min_length=1)
+    cron_expression: Optional[str] = Field(None, min_length=1)
+    is_enabled: Optional[bool] = None
+
+
+class ScheduledTaskResponse(BaseModel):
+    id: int
+    name: str
+    description: Optional[str]
+    task_sql_type: str
+    instance_id: int
+    instance_name: Optional[str] = None
+    instance_db_type: Optional[str] = None
+    target_db: Optional[str]
+    target_table: Optional[str]
+    sql_content: str
+    cron_expression: str
+    is_enabled: bool
+    last_run_at: Optional[datetime]
+    last_run_status: Optional[str]
+    last_run_message: Optional[str]
+    next_run_at: Optional[datetime]
+    run_count: int
+    created_by: Optional[int]
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class ScheduledTaskLogResponse(BaseModel):
+    id: int
+    task_id: int
+    status: str
+    sql_content: Optional[str]
+    affected_rows: int
+    duration_ms: Optional[int]
+    error_message: Optional[str]
+    started_at: datetime
+    finished_at: Optional[datetime]
+
+    class Config:
+        from_attributes = True
+
+
+class TaskRunResponse(BaseModel):
+    success: bool
+    message: str
+    affected_rows: int = 0
+    duration_ms: int = 0

backend/app/schemas/ticket.py

@@ -21,9 +21,11 @@ class TicketReview(BaseModel):
 
 class TicketResponse(BaseModel):
     id: int
+    ticket_no: Optional[str] = None
     title: str
     db_type: str
     instance_id: int
+    instance_name: Optional[str] = None
     target_database: str
     sql_content: str
     rollback_sql: Optional[str] = None
@@ -33,6 +35,7 @@ class TicketResponse(BaseModel):
     applicant_name: Optional[str] = None
     approver_id: Optional[int] = None
     approver_name: Optional[str] = None
+    current_approver_name: Optional[str] = None
     reason: Optional[str] = None
     audit_result: Optional[str] = None
     execute_result: Optional[str] = None

backend/app/schemas/workflow.py

@@ -33,6 +33,7 @@ class WorkflowUpdate(BaseModel):
     name: Optional[str] = None
     description: Optional[str] = None
     is_active: Optional[bool] = None
+    steps: Optional[List[WorkflowStepCreate]] = None
 
 
 class WorkflowResponse(BaseModel):