feat: Dashboard数据关联修复 + 通知模板优化 + 工单创建页布局

1. Dashboard: stats新增queryStats查询统计, trend API真实工单趋势数据
2. Layout铃铛: 显示真实待审批工单数量
3. 通知模板优化:
   - 创建工单通知: 含申请人+目标实例+库+SQL摘要
   - 审批通过/拒绝通知: 含审批人+目标实例
   - 执行完成/失败通知: 含执行人+目标实例+库
4. 飞书卡片颜色: 创建=turquoise, 审批=blue, 成功=green, 失败=red
5. 钉钉消息: 添加状态emoji标签(🆕✅❌⚠️)
6. TicketCreatePage: 底部操作栏(SQL检测+提交审批)
7. ticket_executor: 移除aiomysql不支持的read_timeout/write_timeout

Tests: 1057 passed, 17 pre-existing failures (notification 35/35 passed)

backend/app/api/v1/endpoints/ticket.py

@@ -447,6 +447,12 @@ async def create_ticket(
     await db.commit()
     await db.refresh(ticket)
 
+    # 9. 发送创建通知
+    try:
+        await _send_ticket_notification(db, ticket, "ticket_created")
+    except Exception as notify_err:
+        logger.error("创建通知发送失败: %s", notify_err)
+
     result = await _enrich_ticket(ticket, db)
     if v2_report:
         result["audit_report"] = v2_report.to_dict()
@@ -663,6 +669,17 @@ async def review_ticket(
 
     await db.commit()
     await db.refresh(ticket)
+
+    # 发送审批通知
+    try:
+        event_type = "ticket_approved" if data.action == "approve" else "ticket_rejected"
+        await _send_ticket_notification(db, ticket, event_type, {
+            "approver": current_user.display_name,
+            "comment": data.comment or ("审批通过" if data.action == "approve" else "审批拒绝"),
+        })
+    except Exception as notify_err:
+        logger.error("审批通知发送失败: %s", notify_err)
+
     return await _enrich_ticket(ticket, db)
 
 
@@ -1027,65 +1044,122 @@ async def execute_ticket(
     return ticket_data
 
 
-async def _send_execution_notification(
-    db: AsyncSession, ticket: Ticket, report: "ExecutionReport"
-) -> None:
-    """发送工单执行完成通知。
+async def _get_user_name(db: AsyncSession, user_id: Optional[int]) -> str:
+    """获取用户显示名称。"""
+    if not user_id:
+        return "系统"
+    result = await db.execute(select(User).where(User.id == user_id))
+    user = result.scalar_one_or_none()
+    return user.display_name if user else "未知"
 
-    查询已启用的通知渠道并发送执行结果通知。
+
+async def _get_instance_name(db: AsyncSession, instance_id: Optional[int]) -> str:
+    """获取实例名称。"""
+    if not instance_id:
+        return "未知实例"
+    result = await db.execute(select(Instance).where(Instance.id == instance_id))
+    inst = result.scalar_one_or_none()
+    return inst.name if inst else "未知实例"
+
+
+async def _get_enabled_channels(db: AsyncSession) -> list:
+    """获取已启用的通知渠道。"""
+    from app.models.notification import NotificationChannel
+    result = await db.execute(
+        select(NotificationChannel).where(NotificationChannel.is_enabled == True)
+    )
+    return result.scalars().all()
+
+
+async def _send_ticket_notification(
+    db: AsyncSession, ticket: Ticket, event_type: str,
+    extra_data: Optional[Dict[str, Any]] = None,
+) -> None:
+    """通用工单通知发送。
 
     Args:
         db: 数据库会话
         ticket: 工单对象
-        report: 执行报告
+        event_type: 事件类型 (ticket_created / ticket_approved / ticket_rejected / ticket_executed / ticket_failed)
+        extra_data: 额外模板数据 (如 approver, operator, error 等)
     """
-    from app.models.notification import NotificationChannel
     from app.services.notification_sender import NotificationSender
 
-    result = await db.execute(
-        select(NotificationChannel).where(NotificationChannel.is_enabled == True)
-    )
-    channels = result.scalars().all()
-
+    channels = await _get_enabled_channels(db)
     if not channels:
         return
 
-    sender = NotificationSender()
-
-    # 确定事件类型
-    if report.status == "success":
-        event_type = "ticket_executed"
-    else:
-        event_type = "ticket_failed"
-
-    # 构建 SQL 预览（前 100 字符）
+    # 获取关联信息
+    applicant_name = await _get_user_name(db, ticket.applicant_id)
+    instance_name = await _get_instance_name(db, ticket.instance_id)
     sql_preview = ticket.sql_content[:100] + "..." if len(ticket.sql_content) > 100 else ticket.sql_content
 
-    # 获取申请人信息
-    applicant_name = "未知"
-    if ticket.applicant_id:
-        result = await db.execute(
-            select(User).where(User.id == ticket.applicant_id)
-        )
-        applicant = result.scalar_one_or_none()
-        if applicant:
-            applicant_name = applicant.display_name
-
     notification_data = {
         "title": ticket.title,
         "ticket_id": ticket.id,
+        "ticket_no": ticket.ticket_no or str(ticket.id),
         "db_type": ticket.db_type,
-        "target_database": ticket.target_database,
+        "target_database": ticket.target_database or "",
+        "instance_name": instance_name,
         "sql_preview": sql_preview,
-        "priority": ticket.priority,
         "applicant": applicant_name,
+        "approver": "未知",
+        "operator": "系统",
+        "comment": "",
+        "result": "",
+        "duration": 0,
+        "affected_rows": 0,
+        "error": "",
+    }
+
+    # 合并额外数据
+    if extra_data:
+        notification_data.update(extra_data)
+
+    sender = NotificationSender()
+    await sender.notify_ticket_event(
+        ticket_id=ticket.id,
+        event_type=event_type,
+        channels=channels,
+        ticket_data=notification_data,
+    )
+
+
+async def _send_execution_notification(
+    db: AsyncSession, ticket: Ticket, report: "ExecutionReport"
+) -> None:
+    """发送工单执行完成通知（兼容旧调用）。"""
+    from app.services.notification_sender import NotificationSender
+
+    channels = await _get_enabled_channels(db)
+    if not channels:
+        return
+
+    event_type = "ticket_executed" if report.status == "success" else "ticket_failed"
+    operator_name = await _get_user_name(db, ticket.approver_id)
+    instance_name = await _get_instance_name(db, ticket.instance_id)
+    applicant_name = await _get_user_name(db, ticket.applicant_id)
+    sql_preview = ticket.sql_content[:100] + "..." if len(ticket.sql_content) > 100 else ticket.sql_content
+
+    notification_data = {
+        "title": ticket.title,
+        "ticket_id": ticket.id,
+        "ticket_no": ticket.ticket_no or str(ticket.id),
+        "db_type": ticket.db_type,
+        "target_database": ticket.target_database or "",
+        "instance_name": instance_name,
+        "sql_preview": sql_preview,
+        "applicant": applicant_name,
+        "operator": operator_name,
         "result": report.status,
         "duration": report.duration_ms,
         "affected_rows": report.affected_rows,
         "error": "; ".join(report.errors[:3]) if report.errors else "",
-        "operator": "dba",
+        "approver": operator_name,
+        "comment": "",
     }
 
+    sender = NotificationSender()
     await sender.notify_ticket_event(
         ticket_id=ticket.id,
         event_type=event_type,