feat(sub): add per-client subscription HWID limits (#5802)

* feat(sub): add per-client subscription HWID limits

* fix(sub): address HWID review on shared subId and bulk create

* fix(sub): store HWID devices by sub_id and drop anchor client workaround

* fix(sub): restore UA auto-detect and HTML page routing in subs()

The cherry-pick of the HWID gate onto main's refactored SUBController
had dropped main's UA-based format auto-detection and sub-page handling
from subs(). Restore those branches, slotting enforceHwid after the
HTML page and before format detection so the gate only applies to
machine-readable subscription bodies.

Also adapt tests to main's options-struct constructor and to the
ClientService.Update signature extended with limitHwid.

* fix(frontend): drop axios from HttpUtil.delete

The bulk-delete rework's committed version still referenced axios,
which this file no longer imports, breaking typecheck in CI. Use the
httpRequest wrapper like the other verbs.

---------

Co-authored-by: Sanaei <ho3ein.sanaei@gmail.com>

frontend/src/pages/clients/ClientBulkAddModal.tsx

@@ -33,6 +33,7 @@ const EMPTY: ClientBulkAddFormValues = {
   comment: '',
   flow: '',
   limitIp: 0,
+  limitHwid: 0,
   totalGB: 0,
   expiryTime: 0,
   reset: 0,
@@ -176,6 +177,7 @@ export default function ClientBulkAddModal({
           expiryTime: current.expiryTime,
           reset: Number(current.reset) || 0,
           limitIp: Number(current.limitIp) || 0,
+          limitHwid: Number(current.limitHwid) || 0,
           group: current.group,
           comment: current.comment,
           enable: true,
@@ -301,6 +303,15 @@ export default function ClientBulkAddModal({
               />
             </FormField>
 
+            <FormField
+              name="limitHwid"
+              label={t('pages.clients.limitHwid')}
+              tooltip={t('pages.clients.limitHwidDesc')}
+              transform={{ output: (v) => Number(v) || 0 }}
+            >
+              <InputNumber min={0} />
+            </FormField>
+
             <FormField name="comment" label={t('comment')}>
               <Input />
             </FormField>