✨ Account and auth protobuf and client code

DysonNetwork.Shared/DysonNetwork.Shared.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <Protobuf Include="Protos\*.proto" GrpcServices="Client" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Grpc.Net.Client" Version="2.65.0" />
+        <PackageReference Include="Google.Protobuf" Version="3.27.2" />
+        <PackageReference Include="Grpc.Tools" Version="2.65.0">
+            <PrivateAssets>all</PrivateAssets>
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+        </PackageReference>
+    </ItemGroup>
+
+</Project>

DysonNetwork.Shared/Protos/account.proto

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+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;
+}

DysonNetwork.Shared/Protos/auth.proto

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+syntax = "proto3";
+
+package dyson_network.sphere.auth;
+
+import "google/protobuf/empty.proto";
+import "google/protobuf/timestamp.proto";
+
+option csharp_namespace = "DysonNetwork.Sphere.Auth.Proto";
+
+service AuthService {
+  // Standard username/password login
+  rpc Login(LoginRequest) returns (LoginResponse);
+
+  // Introspects an OAuth 2.0 access token.
+  rpc IntrospectToken(IntrospectTokenRequest) returns (IntrospectionResponse);
+
+  // Logs out the current session
+  rpc Logout(google.protobuf.Empty) returns (google.protobuf.Empty);
+}
+
+message LoginRequest {
+  string username = 1;
+  string password = 2;
+  // Optional: for 2FA
+  string two_factor_code = 3;
+}
+
+message LoginResponse {
+  string access_token = 1;
+  string refresh_token = 2;
+  int64 expires_in = 3;
+}
+
+message IntrospectTokenRequest {
+  string token = 1;
+  // Optional: token_type_hint can be "access_token" or "refresh_token"
+  string token_type_hint = 2;
+}
+
+message IntrospectionResponse {
+  // Indicates whether or not the token is currently active.
+  bool active = 1;
+  // A JSON string containing the claims of the token.
+  string claims = 2;
+  // The client identifier for the OAuth 2.0 client that requested the token.
+  string client_id = 3;
+  // The username of the resource owner who authorized the token.
+  string username = 4;
+  // The scope of the access token.
+  string scope = 5;
+  // The time at which the token was issued.
+  google.protobuf.Timestamp iat = 6;
+  // The time at which the token expires.
+  google.protobuf.Timestamp exp = 7;
+}