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>

internal/web/service/client_update_no_inbound_test.go

@@ -103,7 +103,7 @@ func TestUpdate_PersistsFields_NoInbound(t *testing.T) {
 
 			updated := rec.ToClient()
 			tc.mutate(updated)
-			if _, err := svc.Update(inboundSvc, rec.Id, *updated); err != nil {
+			if _, err := svc.Update(inboundSvc, rec.Id, *updated, rec.LimitHwid); err != nil {
 				t.Fatalf("Update: %v", err)
 			}
 
@@ -142,7 +142,7 @@ func TestUpdate_NoInbound_PreservesCredentialsWhenOmitted(t *testing.T) {
 	updated.Auth = ""
 	updated.Secret = ""
 	updated.Comment = "only comment changed"
-	if _, err := svc.Update(inboundSvc, rec.Id, *updated); err != nil {
+	if _, err := svc.Update(inboundSvc, rec.Id, *updated, rec.LimitHwid); err != nil {
 		t.Fatalf("Update: %v", err)
 	}