documentation: Add `preferred_by` route rule item

docs/configuration/route/rule.md

@@ -6,7 +6,8 @@ icon: material/new-box
 
     :material-plus: [interface_address](#interface_address)  
     :material-plus: [network_interface_address](#network_interface_address)  
-    :material-plus: [default_interface_address](#default_interface_address)
+    :material-plus: [default_interface_address](#default_interface_address)  
+    :material-plus: [preferred_by](#preferred_by)
 
 !!! quote "Changes in sing-box 1.11.0"
 
@@ -153,6 +154,10 @@ icon: material/new-box
         "wifi_bssid": [
           "00:00:00:00:00:00"
         ],
+        "preferred_by": [
+          "tailscale",
+          "wireguard"
+        ],
         "rule_set": [
           "geoip-cn",
           "geosite-cn"
@@ -428,6 +433,17 @@ Match WiFi SSID.
 
 Match WiFi BSSID.
 
+#### preferred_by
+
+!!! question "Since sing-box 1.13.0"
+
+Match specified outbounds' preferred routes.
+
+| Type        | Match                                         |
+|-------------|-----------------------------------------------|
+| `tailscale` | Match MagicDNS domains and peers' allowed IPs |
+| `wireguard` | Match peers's allowed IPs                     |
+
 #### rule_set
 
 !!! question "Since sing-box 1.8.0"

docs/configuration/route/rule.zh.md

@@ -6,7 +6,8 @@ icon: material/new-box
 
     :material-plus: [interface_address](#interface_address)  
     :material-plus: [network_interface_address](#network_interface_address)  
-    :material-plus: [default_interface_address](#default_interface_address)
+    :material-plus: [default_interface_address](#default_interface_address)  
+    :material-plus: [preferred_by](#preferred_by)
 
 !!! quote "sing-box 1.11.0 中的更改"
 
@@ -150,6 +151,10 @@ icon: material/new-box
         "wifi_bssid": [
           "00:00:00:00:00:00"
         ],
+        "preferred_by": [
+          "tailscale",
+          "wireguard"
+        ],
         "rule_set": [
           "geoip-cn",
           "geosite-cn"
@@ -425,6 +430,17 @@ icon: material/new-box
 
 匹配 WiFi BSSID。
 
+#### preferred_by
+
+!!! question "自 sing-box 1.13.0 起"
+
+匹配制定出站的首选路由。
+
+| 类型          | 匹配                             |
+|-------------|--------------------------------|
+| `tailscale` | 匹配 MagicDNS 域名和对端的 allowed IPs |
+| `wireguard` | 匹配对端的 allowed IPs              |
+
 #### rule_set
 
 !!! question "自 sing-box 1.8.0 起"