Remove flutter chat (#26)

Had to squash merge manually as Forgejo was erroring

lib/models/info/image.dart

@@ -0,0 +1,18 @@
+import "package:freezed_annotation/freezed_annotation.dart";
+part "image.freezed.dart";
+part "image.g.dart";
+
+@freezed
+abstract class ImageInfo with _$ImageInfo {
+  /// Information for images, [size] is in bytes.
+  const factory ImageInfo({
+    @JsonKey(name: "h") double? height,
+    @JsonKey(name: "w") double? width,
+    @JsonKey(name: "mimetype") String? mimeType,
+    @JsonKey(name: "xyz.amorgan.blurhash") String? blurHash,
+    int? size,
+  }) = _ImageInfo;
+
+  factory ImageInfo.fromJson(Map<String, Object?> json) =>
+      _$ImageInfoFromJson(json);
+}