Add Tailscale endpoint

docs/configuration/dns/server/tailscale.md

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+---
+icon: material/new-box
+---
+
+!!! question "Since sing-box 1.12.0"
+
+# Tailscale
+
+### Structure
+
+```json
+{
+  "dns": {
+    "servers": [
+      {
+        "type": "tailscale",
+        "tag": "",
+
+        "endpoint": "ts-ep",
+        "accept_default_resolvers": false
+      }
+    ]
+  }
+}
+```
+
+### Fields
+
+#### endpoint
+
+==Required==
+
+The tag of the Tailscale endpoint.
+
+#### accept_default_resolvers
+
+Indicates whether default DNS resolvers should be accepted for fallback queries in addition to MagicDNS。
+
+if not enabled, NXDOMAIN will be returned for non-Tailscale domain queries.
+
+### Examples
+
+=== "MagicDNS only"
+
+    ```json
+    {
+      "dns": {
+        "servers": [
+          {
+            "type": "local",
+            "tag": "local"
+          },
+          {
+            "type": "tailscale",
+            "tag": "ts",
+            "endpoint": "ts-ep"
+          }
+        ],
+        "rules": [
+          {
+            "ip_accept_any": true,
+            "server": "ts"
+          }
+        ]
+      }
+    }
+    ```
+
+=== "Use as global DNS"
+
+    ```json
+    {
+      "dns": {
+        "servers": [
+          {
+            "type": "tailscale",
+            "endpoint": "ts-ep",
+            "accept_default_resolvers": true
+          }
+        ]
+      }
+    }
+    ```

docs/configuration/endpoint/tailscale.md

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+---
+icon: material/new-box
+---
+
+!!! question "Since sing-box 1.12.0"
+
+### Structure
+
+```json
+{
+  "type": "tailscale",
+  "tag": "ts-ep",
+  "state_directory": "",
+  "auth_key": "",
+  "control_url": "",
+  "ephemeral": false,
+  "hostname": "",
+  "exit_node": "",
+  "exit_node_allow_lan_access": false,
+  "advertise_routes": [],
+  "advertise_exit_node": false,
+  "udp_timeout": "5m",
+  
+  ... // Dial Fields
+}
+```
+
+### Fields
+
+#### state_directory
+
+The directory where the Tailscale state is stored.
+
+`tailscale` is used by default.
+
+Example: `$HOME/.tailscale`
+
+#### auth_key
+
+!!! note
+    
+    Auth key is not required. By default, sing-box will log the login URL (or popup a notification on graphical clients).
+
+The auth key to create the node. If the node is already created (from state previously stored), then this field is not
+used.
+
+#### control_url
+
+The coordination server URL.
+
+`https://controlplane.tailscale.com` is used by default.
+
+#### ephemeral
+
+Indicates whether the instance should register as an Ephemeral node (https://tailscale.com/s/ephemeral-nodes).
+
+#### hostname
+
+The hostname of the node.
+
+System hostname is used by default.
+
+Example: `localhost`
+
+#### exit_node
+
+The exit node name or IP address to use.
+
+#### exit_node_allow_lan_access
+
+!!! note
+
+    When the exit node does not have a corresponding advertised route, private traffics cannot be routed to the exit node even if `exit_node_allow_lan_access is` set.
+
+Indicates whether locally accessible subnets should be routed directly or via the exit node.
+
+#### advertise_routes
+
+CIDR prefixes to advertise into the Tailscale network as reachable through the current node.
+
+Example: `["192.168.1.1/24"]`
+
+#### advertise_exit_node
+
+Indicates whether the node should advertise itself as an exit node.
+
+#### udp_timeout
+
+UDP NAT expiration time.
+
+`5m` will be used by default.
+
+### Dial Fields
+
+!!! note
+
+    Dial Fields in Tailscale endpoints only control how it connects to the control plane and have nothing to do with actual connections.
+
+See [Dial Fields](/configuration/shared/dial/) for details.