feat: add initial dashbot package implementation

- Created a new Dashbot package with core functionalities.
- Implemented Dashbot window model and notifier for state management.
- Added UI components including Dashbot default page and home page.
- Integrated routing for Dashbot with initial routes defined.
- Included assets for Dashbot icons and set up pubspec.yaml.
- Added tests for Dashbot window notifier to ensure functionality.
- Established a basic README and CHANGELOG for the package.

packages/dashbot/lib/core/utils/dashbot_icons.dart

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+import 'package:flutter/widgets.dart';
+
+class DashbotIcons {
+  DashbotIcons._();
+  static String get dashbotIcon1 =>
+      'packages/dashbot/assets/dashbot_icon_1.png';
+  static String get dashbotIcon2 =>
+      'packages/dashbot/assets/dashbot_icon_2.png';
+
+  static Image getDashbotIcon1({double? width, double? height, BoxFit? fit}) {
+    return Image.asset(dashbotIcon1, width: width, height: height, fit: fit);
+  }
+
+  static Image getDashbotIcon2({double? width, double? height, BoxFit? fit}) {
+    return Image.asset(dashbotIcon2, width: width, height: height, fit: fit);
+  }
+}

packages/dashbot/lib/core/utils/show_dashbot.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../dashbot_dashboard.dart';
+import '../providers/dashbot_window_notifier.dart';
+
+void showDashbotWindow(BuildContext context, WidgetRef ref) {
+  final isDashbotActive = ref.read(dashbotWindowNotifierProvider).isActive;
+  final windowNotifier = ref.read(dashbotWindowNotifierProvider.notifier);
+  if (isDashbotActive) return;
+  final overlay = Overlay.of(context);
+  OverlayEntry? entry;
+
+  entry = OverlayEntry(
+    builder:
+        (context) => DashbotWindow(
+          onClose: () {
+            entry?.remove();
+            windowNotifier.toggleActive();
+          },
+        ),
+  );
+  windowNotifier.toggleActive();
+  overlay.insert(entry);
+}

packages/dashbot/lib/core/utils/utils.dart

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+export 'show_dashbot.dart';
+export 'dashbot_icons.dart';