docs: add backup config fields task record

docs/Tasktracking/2026-04-26-backup-config-fields.md

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+# Task Record
+
+Date: 2026-04-26
+Related Module: web/entity, web/service
+Change Type: Add
+
+## Background
+Need to support scheduled database backup configuration via panel settings. This adds the backup-related fields (enabled, frequency, hour, max count) to the AllSetting entity, default value map, setting groups, and getter methods on SettingService.
+
+## Changes
+- Added BackupEnabled, BackupFrequency, BackupHour, BackupMaxCount fields to AllSetting struct in web/entity/entity.go
+- Added default values for backup settings in defaultValueMap in web/service/setting.go
+- Added "backup" group to settingGroups in web/service/setting.go
+- Added GetBackupEnabled, GetBackupFrequency, GetBackupHour, GetBackupMaxCount getter methods to SettingService
+
+## Impact
+- AllSetting struct gains 4 new fields (no breaking change)
+- SettingService gains 4 new getter methods
+- New "backup" group available in settings API responses
+- Default values: enabled=false, frequency=daily, hour=3, maxCount=10
+
+## Verification
+- `go build ./...` passed with no errors
+- `gofmt -l -w .` produced no formatting changes
+- Manually reviewed diff: fields, defaults, group, and getters all follow existing patterns
+
+## Risks And Follow-Up
+- None. These are additive changes only; no existing functionality is modified.