feat(clients): add inbound filter + mobile page-size control

Filter bar gets an Inbound select next to Protocol — the dropdown is
narrowed to inbounds matching the chosen protocol (or shows everything
when no protocol is picked), with remark search inside the dropdown.
Choosing a protocol clears any inbound selection that no longer fits.

Server side, ClientPageParams gains an Inbound int and ListPaged runs a
clientMatchesInbound check after the protocol filter. The selection
persists in clientsFilterState localStorage alongside the existing
search/filter/protocol entries.

Mobile clients view also grows the AntD Pagination control that was
previously only on the desktop table, so page size / page navigation
are reachable from phones.

web/service/client.go

@@ -828,6 +828,7 @@ type ClientPageParams struct {
 	Search   string `form:"search"`
 	Filter   string `form:"filter"`
 	Protocol string `form:"protocol"`
+	Inbound  int    `form:"inbound"`
 	Sort     string `form:"sort"`
 	Order    string `form:"order"`
 }
@@ -928,6 +929,9 @@ func (s *ClientService) ListPaged(inboundSvc *InboundService, settingSvc *Settin
 		if params.Protocol != "" && !clientMatchesProtocol(c, params.Protocol, protocolByInbound) {
 			continue
 		}
+		if params.Inbound > 0 && !clientMatchesInbound(c, params.Inbound) {
+			continue
+		}
 		if params.Filter != "" && !clientMatchesBucket(c, params.Filter, onlineSet, nowMs, expireDiffMs, trafficDiffBytes) {
 			continue
 		}
@@ -1046,6 +1050,18 @@ func clientMatchesProtocol(c ClientWithAttachments, protocol string, byInbound m
 	return false
 }
 
+func clientMatchesInbound(c ClientWithAttachments, inboundId int) bool {
+	if inboundId <= 0 {
+		return true
+	}
+	for _, id := range c.InboundIds {
+		if id == inboundId {
+			return true
+		}
+	}
+	return false
+}
+
 func clientMatchesBucket(c ClientWithAttachments, bucket string, onlineSet map[string]struct{}, nowMs, expireDiffMs, trafficDiffBytes int64) bool {
 	if bucket == "" {
 		return true