Initial project snapshot

clients/windows/src/RemoteAccessPlatform.Windows.Contracts/IBackendAuthClient.cs

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+using RemoteAccessPlatform.Windows.Models;
+
+namespace RemoteAccessPlatform.Windows.Contracts;
+
+public interface IBackendAuthClient
+{
+    Task<AuthResultDto> LoginAsync(LoginRequest request, CancellationToken cancellationToken);
+    Task<AuthResultDto> RefreshAsync(RefreshRequest request, CancellationToken cancellationToken);
+    Task RevokeAuthSessionAsync(string userId, string authSessionId, string reason, CancellationToken cancellationToken);
+}

clients/windows/src/RemoteAccessPlatform.Windows.Contracts/IBackendMessageException.cs

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+namespace RemoteAccessPlatform.Windows.Contracts;
+
+public interface IBackendMessageException
+{
+    string Code { get; }
+    string MessageKey { get; }
+    string FallbackMessage { get; }
+    string? TraceId { get; }
+}

clients/windows/src/RemoteAccessPlatform.Windows.Contracts/IBackendOrganizationClient.cs

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+using RemoteAccessPlatform.Windows.Models;
+
+namespace RemoteAccessPlatform.Windows.Contracts;
+
+public interface IBackendOrganizationClient
+{
+    Task<IReadOnlyList<OrganizationDto>> GetOrganizationsAsync(string userId, CancellationToken cancellationToken);
+}

clients/windows/src/RemoteAccessPlatform.Windows.Contracts/IBackendResourceClient.cs

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+using RemoteAccessPlatform.Windows.Models;
+
+namespace RemoteAccessPlatform.Windows.Contracts;
+
+public interface IBackendResourceClient
+{
+    Task<IReadOnlyList<ResourceDto>> GetResourcesAsync(string userId, string organizationId, CancellationToken cancellationToken);
+}

clients/windows/src/RemoteAccessPlatform.Windows.Contracts/IBackendSessionClient.cs

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+using RemoteAccessPlatform.Windows.Models;
+
+namespace RemoteAccessPlatform.Windows.Contracts;
+
+public interface IBackendSessionClient
+{
+    Task<IReadOnlyList<RemoteSessionDto>> GetSessionsAsync(string userId, CancellationToken cancellationToken);
+    Task<SessionControlResultDto> StartSessionAsync(StartSessionRequest request, CancellationToken cancellationToken);
+    Task<SessionControlResultDto> AttachSessionAsync(string sessionId, AttachSessionRequest request, CancellationToken cancellationToken);
+    Task<SessionControlResultDto> DetachSessionAsync(string sessionId, DetachSessionRequest request, CancellationToken cancellationToken);
+    Task<SessionControlResultDto> TakeoverSessionAsync(string sessionId, TakeoverSessionRequest request, CancellationToken cancellationToken);
+    Task TerminateSessionAsync(string sessionId, TerminateSessionRequest request, CancellationToken cancellationToken);
+}

clients/windows/src/RemoteAccessPlatform.Windows.Contracts/IDeviceIdentityProvider.cs

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+namespace RemoteAccessPlatform.Windows.Contracts;
+
+public interface IDeviceIdentityProvider
+{
+    Task<string> GetOrCreateFingerprintAsync(CancellationToken cancellationToken);
+    Task<string> GetDeviceLabelAsync(CancellationToken cancellationToken);
+}

clients/windows/src/RemoteAccessPlatform.Windows.Contracts/ILocalSettingsStore.cs

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+using RemoteAccessPlatform.Windows.Models;
+
+namespace RemoteAccessPlatform.Windows.Contracts;
+
+public interface ILocalSettingsStore
+{
+    Task<LocalClientSettings> LoadAsync(CancellationToken cancellationToken);
+    Task SaveAsync(LocalClientSettings settings, CancellationToken cancellationToken);
+}

clients/windows/src/RemoteAccessPlatform.Windows.Contracts/ISessionGatewayClient.cs

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+using RemoteAccessPlatform.Windows.Models;
+
+namespace RemoteAccessPlatform.Windows.Contracts;
+
+public interface ISessionGatewayClient
+{
+    Task<ISessionGatewayConnection> ConnectAsync(
+        string attachToken,
+        DataPlaneOfferDto? dataPlane,
+        Func<LiveTransportEnvelopeDto, Task> onEnvelope,
+        Func<Exception?, Task> onClosed,
+        CancellationToken cancellationToken);
+}
+
+public interface ISessionGatewayConnection : IAsyncDisposable
+{
+    bool IsConnected { get; }
+    string TransportKind { get; }
+    Task SendInputAsync(SessionInputEventDto inputEvent, CancellationToken cancellationToken);
+    Task SendClipboardTextAsync(string text, string origin, string contentHash, long sequenceId, CancellationToken cancellationToken);
+    Task SendFileUploadStartAsync(FileUploadStartDto upload, CancellationToken cancellationToken);
+    Task SendFileUploadChunkAsync(FileUploadChunkDto chunk, CancellationToken cancellationToken);
+    Task SendFileUploadCancelAsync(string transferId, CancellationToken cancellationToken);
+    Task SendFileDownloadStartAsync(FileDownloadStartDto download, CancellationToken cancellationToken);
+    Task SendFileDownloadAckAsync(FileDownloadAckDto ack, CancellationToken cancellationToken);
+    Task SendFileDownloadCancelAsync(string transferId, CancellationToken cancellationToken);
+}

clients/windows/src/RemoteAccessPlatform.Windows.Contracts/ITokenStore.cs

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+using RemoteAccessPlatform.Windows.Models;
+
+namespace RemoteAccessPlatform.Windows.Contracts;
+
+public interface ITokenStore
+{
+    Task<StoredAuthState?> LoadAsync(CancellationToken cancellationToken);
+    Task SaveAsync(StoredAuthState state, CancellationToken cancellationToken);
+    Task ClearAsync(CancellationToken cancellationToken);
+}

clients/windows/src/RemoteAccessPlatform.Windows.Contracts/RemoteAccessPlatform.Windows.Contracts.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+</PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\RemoteAccessPlatform.Windows.Models\RemoteAccessPlatform.Windows.Models.csproj" />
+  </ItemGroup>
+
+</Project>