feat(channel-monitor): apply template via subset picker; CC 2.1.114 baseline doc

Apply flow:
- POST /admin/channel-monitor-templates/:id/apply now requires monitor_ids
  (non-empty array). Service applies the template only to the selected
  subset, gated by AND template_id = :id (so users can't sneak in
  unrelated monitor IDs).
- New GET /admin/channel-monitor-templates/:id/monitors returns the
  associated monitor briefs (id/name/provider/enabled) for the picker.
- ApplyToMonitors signature gains monitorIDs []int64; empty list returns
  ErrChannelMonitorTemplateApplyEmpty.

Frontend:
- New MonitorTemplateApplyPickerDialog.vue: list of associated monitors
  with checkboxes (default all checked), 全选 / 全不选 shortcuts, live
  selected/total count. Submit calls apply(id, ids).
- MonitorTemplateManagerDialog replaces the old ConfirmDialog flow with
  the picker; onApplied refetches the list to refresh associated counts.

i18n: applyPicker* + common.selectAll keys.

chore: bump version to 0.1.114.33

The CC 2.1.114 (sdk-cli) UA / APIKeyBetaHeader / JSON metadata.user_id
baseline (already verified working via the in-process apply on prod
template id=1) is documented in internal/pkg/claude/constants.go and
is what the seed template in the manager UI should follow.

frontend/src/i18n/locales/en.ts

@@ -273,6 +273,7 @@ export default {
     no: 'No',
     all: 'All',
     none: 'None',
+    selectAll: 'Select all',
     noData: 'No data',
     expand: 'Expand',
     collapse: 'Collapse',
@@ -2192,11 +2193,17 @@ export default {
         updateSuccess: 'Template updated',
         deleteSuccess: 'Template deleted',
         applyButton: 'Apply to monitors',
-        applyTooltip: 'Overwrite snapshot fields on all associated monitors',
+        applyTooltip: 'Overwrite snapshot fields on associated monitors',
         applyTitle: 'Apply template',
         applyConfirm: 'Apply',
         applyConfirmMessage: 'Overwrite {n} associated monitor(s) with the current configuration of "{name}"? Any local customizations on those monitors will be discarded.',
         applySuccess: 'Applied to {n} monitor(s)',
+        applyPickerTitle: 'Apply template "{name}"',
+        applyPickerHint: 'Select which monitors to overwrite (all selected by default). Any local customizations will be discarded.',
+        applyPickerEmpty: 'No monitors are currently associated to this template',
+        applyPickerConfirm: 'Apply to {n} monitor(s)',
+        selectNone: 'Select none',
+        selectedCount: 'Selected {n} / {total}',
         deleteConfirm: 'Delete template "{name}"? {n} associated monitor(s) will be disassociated but keep their current snapshot and continue running.',
         associatedCount: '{n} associated monitor(s)',
         headersSummary: '{n} custom header(s)',