Defined data structures for configuring the initial dats sources

app/MindWork AI Studio/Settings/DataModel/DataSourceERI.cs

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+namespace AIStudio.Settings.DataModel;
+
+/// <summary>
+/// An external data source, accessed via an ERI server, cf. https://github.com/MindWorkAI/ERI.
+/// </summary>
+public readonly record struct DataSourceERI : IDataSource
+{
+    public DataSourceERI()
+    {
+    }
+    
+    /// <inheritdoc />
+    public uint Num { get; init; }
+
+    /// <inheritdoc />
+    public string Id { get; init; } = Guid.Empty.ToString();
+    
+    /// <inheritdoc />
+    public string Name { get; init; } = string.Empty;
+    
+    /// <inheritdoc />
+    public DataSourceType Type { get; init; } = DataSourceType.NONE;
+    
+    /// <summary>
+    /// The hostname of the ERI server.
+    /// </summary>
+    public string Hostname { get; init; } = string.Empty;
+    
+    /// <summary>
+    /// The port of the ERI server.
+    /// </summary>
+    public int Port { get; init; }
+}

app/MindWork AI Studio/Settings/DataModel/DataSourceLocalDirectory.cs

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+namespace AIStudio.Settings.DataModel;
+
+/// <summary>
+/// Represents a local directory as a data source.
+/// </summary>
+public readonly record struct DataSourceLocalDirectory : IDataSource
+{
+    public DataSourceLocalDirectory()
+    {
+    }
+
+    /// <inheritdoc />
+    public uint Num { get; init; }
+
+    /// <inheritdoc />
+    public string Id { get; init; } = Guid.Empty.ToString();
+    
+    /// <inheritdoc />
+    public string Name { get; init; } = string.Empty;
+    
+    /// <inheritdoc />
+    public DataSourceType Type { get; init; } = DataSourceType.NONE;
+    
+    /// <summary>
+    /// The path to the directory.
+    /// </summary>
+    public string Path { get; init; } = string.Empty;
+}

app/MindWork AI Studio/Settings/DataModel/DataSourceLocalFile.cs

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+namespace AIStudio.Settings.DataModel;
+
+/// <summary>
+/// Represents one local file as a data source.
+/// </summary>
+public readonly record struct DataSourceLocalFile : IDataSource
+{
+    public DataSourceLocalFile()
+    {
+    }
+
+    /// <inheritdoc />
+    public uint Num { get; init; }
+
+    /// <inheritdoc />
+    public string Id { get; init; } = Guid.Empty.ToString();
+    
+    /// <inheritdoc />
+    public string Name { get; init; } = string.Empty;
+    
+    /// <inheritdoc />
+    public DataSourceType Type { get; init; } = DataSourceType.NONE;
+    
+    /// <summary>
+    /// The path to the file.
+    /// </summary>
+    public string FilePath { get; init; } = string.Empty;
+}

app/MindWork AI Studio/Settings/IDataSource.cs

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+using AIStudio.Settings.DataModel;
+
+namespace AIStudio.Settings;
+
+/// <summary>
+/// The common interface for all data sources.
+/// </summary>
+public interface IDataSource
+{
+    /// <summary>
+    /// The number of the data source.
+    /// </summary>
+    public uint Num { get; init; }
+
+    /// <summary>
+    /// The unique identifier of the data source.
+    /// </summary>
+    public string Id { get; init; }
+
+    /// <summary>
+    /// The name of the data source.
+    /// </summary>
+    public string Name { get; init; }
+
+    /// <summary>
+    /// Which type of data source is this?
+    /// </summary>
+    public DataSourceType Type { get; init; }
+}