Add register and sign up with supertokens

Frontend/patient_manager/lib/objects/appUser.dart

@@ -2,28 +2,31 @@
 class AppUser {
   final int idusers;
   final String email;
-  final int docOffice_id;
+  final int docOffice_ID;
   final String fname;
   final String lname;
   final String title;
+  final String app_id;
 
   const AppUser(
     this.idusers,
     this.email,
-    this.docOffice_id,
+    this.docOffice_ID,
     this.fname,
     this.lname,
     this.title,
+    this.app_id,
   );
 
   factory AppUser.fromJson(dynamic json) {
     return AppUser(
       json['idusers'],
       json['email'],
-      json['docOffice_id'],
+      json['docOffice_ID'],
       json['fname'],
       json['lname'],
       json['title'],
+      json['app_id'],
     );
   }
 }

Frontend/patient_manager/lib/objects/sessionST.dart

@@ -0,0 +1,23 @@
+class SessionST {
+  final String status;
+  final bool exists;
+
+  const SessionST({
+    required this.status,
+    required this.exists,
+  });
+
+  factory SessionST.fromJson(Map<String, dynamic> json) {
+    return switch (json) {
+      {
+        'status': String status,
+        'exists': bool exists,
+      } =>
+        SessionST(
+          status: status,
+          exists: exists,
+        ),
+      _ => throw const FormatException('Failed to load SessionST.'),
+    };
+  }
+}