documentation: Refactor DNS

docs/configuration/dns/server/local.md

@@ -0,0 +1,33 @@
+---
+icon: material/new-box
+---
+
+!!! question "Since sing-box 1.12.0"
+
+# Local
+
+### Structure
+
+```json
+{
+  "dns": {
+    "servers": [
+      {
+        "type": "local",
+        "tag": "",
+
+        // Dial Fields
+      }
+    ]
+  }
+}
+```
+
+!!! info "Difference from legacy local server"
+    
+    * The old legacy local server only handles IP requests; the new one handles all types of requests and supports concurrent for IP requests.
+    * The old local server uses default outbound by default unless detour is specified; the new one uses dialer just like outbound, which is equivalent to using an empty direct outbound by default.
+
+### Dial Fields
+
+See [Dial Fields](/configuration/shared/dial/) for details.