refactor: replace custom geo manager with Xray-core native geodata auto-update

Remove the panel-side custom geo download feature (service, controller,
/panel/api/custom-geo/* endpoints, CustomGeoResource model, UI tab) in
favor of Xray-core's native geodata section
(https://xtls.github.io/config/geodata.html).

- pass the top-level "geodata" key through xray.Config so it survives
  the template round-trip into the generated config
- add a Geodata Auto-Update section to the Xray Updates modal that
  edits geodata (cron schedule, download outbound, asset list) in the
  config template and restarts Xray on save
- previously downloaded geo files in the bin folder keep working in
  ext: routing rules; the orphaned custom_geo_resources table is left
  in place so existing source URLs stay recoverable

frontend/src/pages/groups/GroupAddClientsModal.tsx

@@ -122,7 +122,7 @@ export default function GroupAddClientsModal({
         {t('pages.groups.addToGroupDesc')}
       </Typography.Paragraph>
 
-      <Space direction="vertical" size="small" style={{ width: '100%' }}>
+      <Space orientation="vertical" size="small" style={{ width: '100%' }}>
         <Space style={{ width: '100%', justifyContent: 'space-between' }} wrap>
           <Input.Search
             allowClear

frontend/src/pages/groups/GroupRemoveClientsModal.tsx

@@ -110,7 +110,7 @@ export default function GroupRemoveClientsModal({
         {t('pages.groups.removeFromGroupDesc')}
       </Typography.Paragraph>
 
-      <Space direction="vertical" size="small" style={{ width: '100%' }}>
+      <Space orientation="vertical" size="small" style={{ width: '100%' }}>
         <Space style={{ width: '100%', justifyContent: 'space-between' }} wrap>
           <Input.Search
             allowClear