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/model/dashbot_window_model.dart

@@ -0,0 +1,31 @@
+class DashbotWindowModel {
+  final double width;
+  final double height;
+  final double right;
+  final double bottom;
+  final bool isActive;
+
+  const DashbotWindowModel({
+    this.width = 350,
+    this.height = 450,
+    this.right = 50,
+    this.bottom = 100,
+    this.isActive = false,
+  });
+
+  DashbotWindowModel copyWith({
+    double? width,
+    double? height,
+    double? right,
+    double? bottom,
+    bool? isActive,
+  }) {
+    return DashbotWindowModel(
+      width: width ?? this.width,
+      height: height ?? this.height,
+      right: right ?? this.right,
+      bottom: bottom ?? this.bottom,
+      isActive: isActive ?? this.isActive,
+    );
+  }
+}