add auth register

lib/features/auth/data/models/auth_session_model.dart

@@ -57,6 +57,48 @@ sealed class AuthSessionResponse with _$AuthSessionResponse {
       _$AuthSessionResponseFromJson(json);
 }
 
+/// Session Data (for GET SESSION API)
+///
+/// Represents the session data structure from get_session API.
+@freezed
+sealed class GetSessionData with _$GetSessionData {
+  const factory GetSessionData({
+    required String sid,
+    @JsonKey(name: 'csrf_token') required String csrfToken,
+  }) = _GetSessionData;
+
+  factory GetSessionData.fromJson(Map<String, dynamic> json) =>
+      _$GetSessionDataFromJson(json);
+}
+
+/// Get Session Message
+///
+/// Wrapper for session data in get_session API response.
+@freezed
+sealed class GetSessionMessage with _$GetSessionMessage {
+  const factory GetSessionMessage({
+    required GetSessionData data,
+  }) = _GetSessionMessage;
+
+  factory GetSessionMessage.fromJson(Map<String, dynamic> json) =>
+      _$GetSessionMessageFromJson(json);
+}
+
+/// Get Session Response
+///
+/// Complete response from get_session API.
+@freezed
+sealed class GetSessionResponse with _$GetSessionResponse {
+  const factory GetSessionResponse({
+    required GetSessionMessage message,
+    @JsonKey(name: 'home_page') required String homePage,
+    @JsonKey(name: 'full_name') required String fullName,
+  }) = _GetSessionResponse;
+
+  factory GetSessionResponse.fromJson(Map<String, dynamic> json) =>
+      _$GetSessionResponseFromJson(json);
+}
+
 /// Session Storage Model
 ///
 /// Simplified model for storing session data in Hive.
@@ -73,7 +115,17 @@ sealed class SessionData with _$SessionData {
   factory SessionData.fromJson(Map<String, dynamic> json) =>
       _$SessionDataFromJson(json);
 
-  /// Create from API response
+  /// Create from get_session API response
+  factory SessionData.fromGetSessionResponse(GetSessionResponse response) {
+    return SessionData(
+      sid: response.message.data.sid,
+      csrfToken: response.message.data.csrfToken,
+      fullName: response.fullName,
+      createdAt: DateTime.now(),
+    );
+  }
+
+  /// Create from auth login API response
   factory SessionData.fromAuthResponse(AuthSessionResponse response) {
     return SessionData(
       sid: response.message.sid,