feat(sub): per-inbound sort order for subscription links

Add a subSortIndex field to inbounds that controls the order of links
in subscription output only: the raw sub body, the HTML sub page, and
the JSON/Clash formats (all served from the same query). Lower values
come first; ties keep id order. The panel inbound list is unaffected.

The value is editable in the inbound form next to the share-address
fields, propagates to nodes via wireInbound, and follows the usual
node-sync rules (copied on import, mirrored while not dirty, never a
structural change).

Rescoped from #5214 by @Ponywka.

internal/web/runtime/remote.go

@@ -490,6 +490,7 @@ func wireInbound(ib *model.Inbound) url.Values {
 	v := url.Values{}
 	v.Set("total", strconv.FormatInt(ib.Total, 10))
 	v.Set("remark", ib.Remark)
+	v.Set("subSortIndex", strconv.Itoa(ib.SubSortIndex))
 	v.Set("enable", strconv.FormatBool(ib.Enable))
 	v.Set("expiryTime", strconv.FormatInt(ib.ExpiryTime, 10))
 	v.Set("listen", ib.Listen)