✨ Account and auth protobuf and client code

DysonNetwork.Shared/Protos/account.proto

@@ -0,0 +1,28 @@
+syntax = "proto3";
+
+package dyson_network.sphere.account;
+
+import "google/protobuf/empty.proto";
+
+option csharp_namespace = "DysonNetwork.Sphere.Account.Proto";
+
+service AccountService {
+  // Retrieves the current user's account information
+  rpc GetAccount(google.protobuf.Empty) returns (AccountResponse);
+
+  // Updates the current user's account information
+  rpc UpdateAccount(UpdateAccountRequest) returns (AccountResponse);
+}
+
+message AccountResponse {
+  string id = 1;
+  string username = 2;
+  string email = 3;
+  string display_name = 4;
+}
+
+message UpdateAccountRequest {
+  // Fields to update
+  optional string email = 1;
+  optional string display_name = 2;
+}