Add Docker support and enhance data models for tender details

- Introduced a .dockerignore file to optimize Docker builds by excluding unnecessary files.
- Updated the Dockerfile to use a Flutter base image, enabling web builds for the application.
- Added new data models for `Lot` and `OrganizationAddress` to represent tender details more accurately.
- Enhanced the `Organization` model to include `companyId` and a nested `address` field.
- Updated the `TenderData` model to include new fields such as `noticeTypeCode`, `formType`, and `lots`, reflecting the API response structure.
- Regenerated necessary code for data models to ensure compatibility with the updated structures.

lib/gen/fonts.gen.dart

@@ -0,0 +1,16 @@
+// dart format width=80
+/// GENERATED CODE - DO NOT MODIFY BY HAND
+/// *****************************************************
+///  FlutterGen
+/// *****************************************************
+
+// coverage:ignore-file
+// ignore_for_file: type=lint
+// ignore_for_file: deprecated_member_use,directives_ordering,implicit_dynamic_list_literal,unnecessary_import
+
+class FontFamily {
+  FontFamily._();
+
+  /// Font family: Roboto
+  static const String roboto = 'Roboto';
+}