feat: 值班新增连续轮换

Author: niuweili

en/on-call/configuration/schedule.mdx

@@ -28,12 +28,9 @@ Understanding these concepts before configuration will help you better plan your
 | **Rotation** | Determines how on-call personnel hand off. For example, "handoff every Monday at 10 AM" |
 | **Override** | Temporarily adjust the on-call person for a specific time period without modifying permanent rules (commonly used for leave, temporary coverage) |
 | **Date Mask** | Select which days to participate in on-call, e.g., Team A on-call Monday to Friday, Team B on weekends |
+| **Continuous Rotation** | When enabled, rotation boundaries are calculated based on shift start time, preventing shifts from being split at 00:00. Only supported when date mask is configured. See [Date mask and continuous rotation](#date-mask-and-continuous-rotation) for details |
 
-<Tab>
-<Frame>
-<img src="https://docs-cdn.flashcat.cloud/images/png/30e98e6bb99dff3585427a1500b65005.png" alt="Schedule" />
-</Frame>
-</Tab>
+![Schedule Concepts](https://docs-cdn.flashcat.cloud/images/png/3423a4f3133d5caa1f0aaebca970d404.png)
 
 ## Configuration Process
 
@@ -86,7 +83,38 @@ When on-call personnel need leave or have temporary conflicts, **don't modify pe
 We recommend having a brief sync meeting between outgoing and incoming on-call personnel before official handoff to confirm outstanding issues and current system status—this is safer than just system notifications.
 </Tip>
 
-## Common Scheduling Scenarios
+## Date mask and continuous rotation
+
+---
+
+### Date mask
+
+Date mask controls which days of the week an on-call rule takes effect. By selecting different day combinations, you can flexibly implement differentiated scheduling between weekdays and weekends.
+
+Common use cases:
+- **Weekday/weekend separation**: Team A on-call during weekdays, Team B on weekends
+- **Specific day scheduling**: Assign certain personnel only on Monday, Wednesday, and Friday
+- **Day/night shift by day**: Configure day and night shift rules for weekdays, and full-day on-call rules for weekends
+
+### Continuous rotation
+
+By default, schedules are divided at 00:00 each calendar day. If a shift spans midnight, it will be split into separate time segments.
+
+![Default Rotation](https://docs-cdn.flashcat.cloud/images/png/695199d7990bf99cafab58ed10be75a1.png)
+
+When **continuous rotation** is enabled, rotation boundaries are calculated based on shift start time rather than the 00:00 cutoff. Each on-call member will complete a full rotation cycle without being split at midnight.
+
+![Continuous Rotation](https://docs-cdn.flashcat.cloud/images/png/d56eca56d65aa17df67110ad4a0c61a7.png)
+
+<Note>
+Consider enabling continuous rotation in the following scenarios:
+- Rotation cycle is 24 hours
+- Shift start time is not 00:00
+- Day-of-week date mask is configured
+- Different rotation rules for weekdays and weekends
+</Note>
+
+## Common scheduling scenarios
 
 ---
 

zh/on-call/configuration/schedule.mdx

@@ -29,6 +29,7 @@ Flashduty On-call 提供极具灵活性的值班编排能力，支持按天、
 | **轮换** | 决定了值班人员如何交接。例如"每周一上午 10 点交接" |
 | **临时调班** | 在不修改长期规则的前提下，临时调整某一段时间的值班人（常用于请假、临时顶班） |
 | **日期掩码** | 选择参与值班的时期，比如周一到周五时 A 团队值班，周末是 B 团队值班 |
+| **连续轮换** | 开启后，轮换边界以班次开始时间为基准计算，避免班次在 00:00 被拆分。仅在配置日期掩码时支持，详见[日期掩码与连续轮换](#日期掩码与连续轮换) |
 
 ![值班表概念图](https://docs-cdn.flashcat.cloud/images/png/3423a4f3133d5caa1f0aaebca970d404.png)
 
@@ -83,6 +84,37 @@ Flashduty On-call 提供极具灵活性的值班编排能力，支持按天、
 建议在正式交接班前，新旧值班人员进行一次简短的同步会，确认遗留问题和当前系统状态，这比单纯的系统通知更安全。
 </Tip>
 
+## 日期掩码与连续轮换
+
+---
+
+### 日期掩码
+
+日期掩码用于控制值班规则在一周中的哪些天生效。通过选择不同的星期组合，可以灵活实现工作日与周末的差异化排班。
+
+常见使用场景：
+- **工作日/周末分离**：工作日由 A 团队值班，周末由 B 团队值班
+- **特定日期值班**：仅在周一、三、五安排某组人员值班
+- **白班/夜班按天区分**：工作日配置白班和夜班规则，周末配置全天值班规则
+
+### 连续轮换
+
+默认情况下，排班按照自然日 00:00 进行切分。如果班次跨越午夜，将被拆分为多个时间段。
+
+![简单轮换](https://docs-cdn.flashcat.cloud/images/png/695199d7990bf99cafab58ed10be75a1.png)
+
+开启**连续轮换**后，轮换边界将以班次开始时间为基准计算，而不再以 00:00 为切分点。每位值班成员将完整执行一个轮换周期，不会因 00:00 被拆分。
+
+![连续轮换](https://docs-cdn.flashcat.cloud/images/png/d56eca56d65aa17df67110ad4a0c61a7.png)
+
+<Note>
+以下场景建议开启连续轮换：
+- 轮换周期为 24 小时
+- 班次开始时间不是 00:00
+- 配置了按星期掩码排班
+- 工作日与周末采用不同轮换规则
+</Note>
+
 ## 常见排班场景
 
 ---