Add Mieru inbound, refactor sudoku. Fixes

docs/configuration/inbound/mieru.md

@@ -0,0 +1,49 @@
+---
+icon: material/new-box
+---
+
+### Structure
+
+```json
+{
+  "type": "mieru",
+  "tag": "mieru-in",
+
+  ... // Listen Fields
+
+  "transport": "TCP",
+  "users": [
+    {
+      "name": "asdf",
+      "password": "hjkl"
+    }
+  ],
+  "traffic_pattern": "GgQIARAK",
+}
+```
+
+### Listen Fields
+
+See [Listen Fields](/configuration/shared/listen/) for details.
+
+### Fields
+
+#### transport
+
+==Required==
+
+Transmission protocol. Allowed values are `TCP` and `UDP`.
+
+#### users
+
+==Required==
+
+A list of mieru user name and password.
+
+#### traffic_pattern
+
+A base64 string to fine tune network behavior.
+
+#### user_hint_is_mandatory
+
+If proxy client doesn't sent user hint, proxy server will refuse the connection.