feat: Add receipt import functionality with file upload and parsing

- Implemented receipt file upload in ImportRepository with multipart request handling.
- Created ParsedReceiptItem model for parsed receipt data.
- Added ReceiptImportTab for user interface to upload and review receipts.
- Updated ImportScreen to include the new ReceiptImportTab alongside RecipeImportTab.
- Introduced flutter_bootstrap.js and index.html for web app initialization.
- Added wimp.wasm and flutter.js for enhanced web performance and capabilities.

flutter/.dart_tool/flutter_build/f8c96b9ba70d270e1df926aec2a1e154/main.dart

@@ -0,0 +1,30 @@
+// @dart=3.3
+// Flutter web bootstrap script for package:recipe_flutter/main.dart.
+//
+// Generated file. Do not edit.
+//
+
+// ignore_for_file: type=lint
+
+import 'dart:ui_web' as ui_web;
+import 'dart:async';
+
+import 'package:recipe_flutter/main.dart' as entrypoint;
+import 'web_plugin_registrant.dart' as pluginRegistrant;
+
+typedef _UnaryFunction = dynamic Function(List<String> args);
+typedef _NullaryFunction = dynamic Function();
+
+Future<void> main() async {
+  await ui_web.bootstrapEngine(
+    runApp: () {
+      if (entrypoint.main is _UnaryFunction) {
+        return (entrypoint.main as _UnaryFunction)(<String>[]);
+      }
+      return (entrypoint.main as _NullaryFunction)();
+    },
+    registerPlugins: () {
+      pluginRegistrant.registerPlugins();
+    },
+  );
+}