fix(sub): expand CIDR hosts in the hosts-first subscription order

The hosts-first order (#6895) rendered each host through its own endpoint
builder, which skipped the CIDR expansion from #6784, so a range host went out
as the bare network address. One helper, hostEndpointMaps, now builds a host's
entries for both orders.

internal/sub/host_order.go

@@ -104,7 +104,7 @@ func (v subscriptionHostVariant) endpoint(s *SubService, inbound *model.Inbound)
 	if v.host == nil {
 		return nil
 	}
-	return []map[string]any{hostToExternalProxyMap(v.host, s.resolveInboundAddress(inbound), inbound.Port)}
+	return hostEndpointMaps(v.host, s.resolveInboundAddress(inbound), inbound.Port)
 }
 
 func (v subscriptionHostVariant) inbound(s *SubService, inbound *model.Inbound) *model.Inbound {

internal/sub/host_order_test.go

@@ -4,6 +4,7 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"net"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -255,3 +256,24 @@ func TestSub_GlobalHostOrder(t *testing.T) {
 	setHostSortMode(t, "inbound-first")
 	assertAll([]string{"203.0.113.5", "shared1.example.com", "shared2.example.com", "a.example.com", "c.example.com", "b.example.com", "shared1.example.com"})
 }
+
+// The hosts-first order renders each host on its own, and a CIDR host must still expand into its
+// random addresses there, as it does in inbound order, on every format.
+func TestSub_HostOrderExpandsCIDRHosts(t *testing.T) {
+	seedSubDB(t)
+	setHostSortMode(t, "hosts-first")
+	ib := seedSubInbound(t, "order-sub", "cidr", 46910, 0, wsTLSStream)
+	seedHost(t, &model.Host{GroupId: "cidr", InboundId: ib.Id, Remark: "R", Address: "198.51.100.0/24", RandomCount: 3})
+	_, cidr, _ := net.ParseCIDR("198.51.100.0/24")
+	for _, format := range []string{"raw", "clash", "json"} {
+		got := renderedHostAddresses(t, format, NewSubService(""))
+		if len(got) != 3 {
+			t.Fatalf("%s addresses = %v, want 3 random addresses from the range", format, got)
+		}
+		for _, addr := range got {
+			if ip := net.ParseIP(addr); ip == nil || !cidr.Contains(ip) {
+				t.Fatalf("%s address %q is not inside 198.51.100.0/24", format, addr)
+			}
+		}
+	}
+}

internal/sub/host_sub.go

@@ -37,33 +37,36 @@ func (s *SubService) hostEndpoints(inbound *model.Inbound, format string) []map[
 		if h.IsDisabled || slices.Contains(h.ExcludeFromSubTypes, format) {
 			continue
 		}
-		if IsCIDR(h.Address) {
-			count := h.RandomCount
-			if count <= 0 {
-				count = 1
-			}
-			ips, err := RandomIPsFromCIDR(h.Address, count)
-			if err == nil && len(ips) > 0 {
-				for i, ip := range ips {
-					hCopy := *h
-					hCopy.Address = ip
-					if len(ips) > 1 {
-						if h.Remark != "" {
-							hCopy.Remark = fmt.Sprintf("%s - %d", h.Remark, i+1)
-						} else {
-							hCopy.Remark = fmt.Sprintf("%d", i+1)
-						}
-					}
-					eps = append(eps, hostToExternalProxyMap(&hCopy, defaultDest, inbound.Port))
-				}
-				continue
-			}
-		}
-		eps = append(eps, hostToExternalProxyMap(h, defaultDest, inbound.Port))
+		eps = append(eps, hostEndpointMaps(h, defaultDest, inbound.Port)...)
 	}
 	return eps
 }
 
+// hostEndpointMaps is one host's externalProxy entries: a CIDR address expands into RandomCount
+// random addresses from the range, any other address is a single entry.
+func hostEndpointMaps(h *model.Host, defaultDest string, defaultPort int) []map[string]any {
+	if IsCIDR(h.Address) {
+		count := max(h.RandomCount, 1)
+		if ips, err := RandomIPsFromCIDR(h.Address, count); err == nil && len(ips) > 0 {
+			eps := make([]map[string]any, 0, len(ips))
+			for i, ip := range ips {
+				hCopy := *h
+				hCopy.Address = ip
+				if len(ips) > 1 {
+					if h.Remark != "" {
+						hCopy.Remark = fmt.Sprintf("%s - %d", h.Remark, i+1)
+					} else {
+						hCopy.Remark = fmt.Sprintf("%d", i+1)
+					}
+				}
+				eps = append(eps, hostToExternalProxyMap(&hCopy, defaultDest, defaultPort))
+			}
+			return eps
+		}
+	}
+	return []map[string]any{hostToExternalProxyMap(h, defaultDest, defaultPort)}
+}
+
 // hostToExternalProxyMap projects a Host onto the externalProxy entry shape the
 // raw/json/clash renderers already consume. Address/port fall back to the
 // inbound's own when the host leaves them blank (override-only host).