Contacts management.

Wino.Core.Domain/Interfaces/IContactPictureFileService.cs

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+using System;
+using System.Threading.Tasks;
+
+namespace Wino.Core.Domain.Interfaces;
+
+/// <summary>
+/// Manages contact picture files stored on disk instead of as base64 in SQLite,
+/// eliminating DB bloat and enabling native WIC hardware-accelerated image loading.
+/// </summary>
+public interface IContactPictureFileService
+{
+    /// <summary>
+    /// Returns the full file path for the given file ID, or null if the file does not exist on disk.
+    /// </summary>
+    string GetContactPicturePath(Guid fileId);
+
+    /// <summary>
+    /// Saves raw image bytes to disk and returns the new file ID.
+    /// </summary>
+    Task<Guid> SaveContactPictureAsync(byte[] imageData);
+
+    /// <summary>
+    /// Deletes the picture file for the given file ID if it exists.
+    /// </summary>
+    Task DeleteContactPictureAsync(Guid fileId);
+
+    /// <summary>
+    /// One-time startup migration: reads AccountContact rows where Base64ContactPicture is set
+    /// but ContactPictureFileId is null, writes the picture bytes to disk, updates the DB row,
+    /// and clears the Base64ContactPicture column.
+    /// </summary>
+    Task MigrateBase64PicturesAsync();
+}