VLESS protocol: Add Reverse Proxy (4) Command and extremely simple config (#5101)

https://github.com/XTLS/Xray-core/issues/5088#issuecomment-3263093341

proxy/vless/account.proto

@@ -6,6 +6,10 @@ option go_package = "github.com/xtls/xray-core/proxy/vless";
 option java_package = "com.xray.proxy.vless";
 option java_multiple_files = true;
 
+message Reverse {
+  string tag = 1;
+}
+
 message Account {
   // ID of the account, in the form of a UUID, e.g., "66ad4540-b58c-4ad2-9926-ea63445a9b57".
   string id = 1;
@@ -16,4 +20,6 @@ message Account {
   uint32 xorMode = 4;
   uint32 seconds = 5;
   string padding = 6;
+
+  Reverse reverse = 7;
 }