feat: start working on sell

lib/data/services/api_client.dart

@@ -304,6 +304,27 @@ class ApiClient {
  * ====================
 */
 
+  Future<Result<Owner>> getSectionOwner() async {
+    final client = Client();
+    try {
+      final headers = await _getHeaders();
+      final response = await client.get(
+        Uri.parse("https://$apiBasePath/owner/self"),
+        headers: headers,
+      );
+      if (response.statusCode == 200) {
+        final json = jsonDecode(response.body);
+        return Result.ok(Owner.fromJSON(json));
+      } else {
+        throw "Unknown error";
+      }
+    } catch (e) {
+      return Result.error(Exception(e));
+    } finally {
+      client.close();
+    }
+  }
+
   /// Call on `/owners` to get a list of all [Owner]s
   Future<Result<List<Owner>>> getOwners() async {
     final client = Client();