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/views/tenders/widgets/main_tenders_slider.dart

@@ -25,8 +25,41 @@ class MainTendersSlider extends StatefulWidget {
 
 class _MainTendersSliderState extends State<MainTendersSlider> {
   final PageController pageController = PageController(initialPage: 0);
+  final ScrollController _scrollController = ScrollController();
   int currentPage = 1;
 
+  /// Start prefetching the next page once this fraction of the currently
+  /// loaded items has been scrolled/swiped past.
+  static const double _prefetchFraction = 0.5;
+
+  @override
+  void initState() {
+    super.initState();
+    _scrollController.addListener(_onScroll);
+  }
+
+  void _onScroll() {
+    if (!_scrollController.hasClients) {
+      return;
+    }
+    final position = _scrollController.position;
+    if (position.maxScrollExtent <= 0) {
+      return;
+    }
+    if (position.pixels >= position.maxScrollExtent * _prefetchFraction) {
+      _maybeLoadMore();
+    }
+  }
+
+  void _maybeLoadMore() {
+    final viewModel = context.read<TendersViewModel>();
+    if (viewModel.hasMoreData &&
+        !viewModel.isLoadingMore &&
+        !viewModel.isLoading) {
+      viewModel.loadMoreTenders();
+    }
+  }
+
   void _goToPreviousPage() {
     if (currentPage == 1) {
       return;
@@ -82,6 +115,7 @@ class _MainTendersSliderState extends State<MainTendersSlider> {
   @override
   void dispose() {
     pageController.dispose();
+    _scrollController.dispose();
     super.dispose();
   }
 
@@ -115,6 +149,12 @@ class _MainTendersSliderState extends State<MainTendersSlider> {
           if (!viewModel.hasFeedbackForTender(id)) {
             viewModel.getTenderFeedback(id);
           }
+
+          // Infinite scroll: once we pass the halfway point of the loaded
+          // tenders, prefetch the next page in the background.
+          if (index >= (widget.tenders.length * _prefetchFraction).floor()) {
+            _maybeLoadMore();
+          }
         },
         itemBuilder: (context, index) {
           final tender = widget.tenders[index];
@@ -230,6 +270,7 @@ class _MainTendersSliderState extends State<MainTendersSlider> {
       children: [
         Expanded(
           child: ListView.separated(
+            controller: _scrollController,
             padding: EdgeInsets.all(16.0.h()),
             itemCount:
                 widget.tenders.length +