Fix task duplication: add single/multi-instance support with UI configuration and stop all running instances (#2837)

* Initial plan

* Stop running tasks before starting new scheduled instance

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Add multi-instance support and fix stop to kill all running instances

- Add allow_multiple_instances field to Crontab model (default: 0 for single instance)
- Add validation for new field in commonCronSchema
- Add getAllPids and killAllTasks utility functions
- Update stop method to kill ALL running instances of a task
- Update runCron to respect allow_multiple_instances config
- Backward compatible: defaults to single instance mode

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Add UI support for allow_multiple_instances configuration

- Add allow_multiple_instances field to ICrontab interface
- Add instance mode selector in task creation/edit modal
- Add translations for instance mode in Chinese and English
- Default to single instance mode for backward compatibility

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Add allow_multiple_instances column migration and optimize db.ts

- Add allow_multiple_instances column to Crontabs table migration
- Refactor migration code to use data-driven approach
- Replace 11 individual try-catch blocks with single loop
- Improve code maintainability and readability

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

src/locales/en-US.json

@@ -533,5 +533,10 @@
   "日志名称不能超过100个字符": "Log name cannot exceed 100 characters",
   "未启用": "Not enabled",
   "默认为 CPU 个数": "Default is the number of CPUs",
-  "Minimum is 4": "Minimum is 4"
+  "Minimum is 4": "Minimum is 4",
+  "实例模式": "Instance Mode",
+  "单实例模式：定时启动新任务前会自动停止旧任务；多实例模式：允许同时运行多个任务实例": "Single instance mode: automatically stop old task before starting new scheduled task; Multi-instance mode: allow multiple task instances to run simultaneously",
+  "请选择实例模式": "Please select instance mode",
+  "单实例": "Single Instance",
+  "多实例": "Multi-Instance"
 }

src/locales/zh-CN.json

@@ -533,5 +533,10 @@
   "日志名称不能超过100个字符": "日志名称不能超过100个字符",
   "未启用": "未启用",
   "默认为 CPU 个数": "默认为 CPU 个数",
-  "最小是 4": "最小是 4"
+  "最小是 4": "最小是 4",
+  "实例模式": "实例模式",
+  "单实例模式：定时启动新任务前会自动停止旧任务；多实例模式：允许同时运行多个任务实例": "单实例模式：定时启动新任务前会自动停止旧任务；多实例模式：允许同时运行多个任务实例",
+  "请选择实例模式": "请选择实例模式",
+  "单实例": "单实例",
+  "多实例": "多实例"
 }

src/pages/crontab/modal.tsx

@@ -180,6 +180,18 @@ const CronModal = ({
         <Form.Item name="labels" label={intl.get('标签')}>
           <EditableTagGroup />
         </Form.Item>
+        <Form.Item
+          name="allow_multiple_instances"
+          label={intl.get('实例模式')}
+          tooltip={intl.get(
+            '单实例模式：定时启动新任务前会自动停止旧任务；多实例模式：允许同时运行多个任务实例',
+          )}
+        >
+          <Select placeholder={intl.get('请选择实例模式')}>
+            <Select.Option value={0}>{intl.get('单实例')}</Select.Option>
+            <Select.Option value={1}>{intl.get('多实例')}</Select.Option>
+          </Select>
+        </Form.Item>
         <Form.Item
           name="log_name"
           label={intl.get('日志名称')}
@@ -194,7 +206,11 @@ const CronModal = ({
                 if (value.length > 100) {
                   return Promise.reject(intl.get('日志名称不能超过100个字符'));
                 }
-                if (!/^(?!.*(?:^|\/)\.{1,2}(?:\/|$))(?:\/)?(?:[\w.-]+\/)*[\w.-]+\/?$/.test(value)) {
+                if (
+                  !/^(?!.*(?:^|\/)\.{1,2}(?:\/|$))(?:\/)?(?:[\w.-]+\/)*[\w.-]+\/?$/.test(
+                    value,
+                  )
+                ) {
                   return Promise.reject(
                     intl.get('日志名称只能包含字母、数字、下划线和连字符'),
                   );

src/pages/crontab/type.ts

@@ -37,6 +37,7 @@ export interface ICrontab {
   nextRunTime: Date;
   sub_id: number;
   extra_schedules?: Array<{ schedule: string }>;
+  allow_multiple_instances?: 1 | 0;
 }
 
 export enum ScheduleType {