dns: Add preferred_by rule item

docs/configuration/dns/rule.md

@@ -6,6 +6,7 @@ icon: material/alert-decagram
 
     :material-plus: [source_mac_address](#source_mac_address)  
     :material-plus: [source_hostname](#source_hostname)  
+    :material-plus: [preferred_by](#preferred_by)  
     :material-plus: [match_response](#match_response)  
     :material-delete-clock: [rule_set_ip_cidr_accept_empty](#rule_set_ip_cidr_accept_empty)  
     :material-plus: [response_rcode](#response_rcode)  
@@ -166,6 +167,10 @@ icon: material/alert-decagram
         "source_hostname": [
           "my-device"
         ],
+        "preferred_by": [
+          "local",
+          "ts-dns"
+        ],
         "wifi_ssid": [
           "My WIFI"
         ],
@@ -496,6 +501,18 @@ Match source device MAC address.
 
 Match source device hostname from DHCP leases.
 
+#### preferred_by
+
+!!! question "Since sing-box 1.14.0"
+
+Match specified DNS servers' preferred domains.
+
+| Type        | Match                                               |
+|-------------|-----------------------------------------------------|
+| `hosts`     | Match predefined entries and entries in hosts files |
+| `local`     | Match hosts entries and neighbor-resolved hosts     |
+| `tailscale` | Match MagicDNS hosts and DNS route suffixes         |
+
 #### wifi_ssid
 
 !!! quote ""