feat: Add main application views and structure

- Implemented CreateInstanceView for creating new instances.
- Added HostsView for managing SSH hosts with CRUD operations.
- Created InstancesView for displaying and managing instances.
- Developed LogsView for viewing operation logs.
- Introduced SecretsView for managing secrets associated with hosts.
- Established SettingsView for configuring application settings.
- Created MainWindow as the main application window with navigation.
- Added app manifest and configuration files for logging and settings.

OTSSignsOrchestrator.Desktop/Views/InstancesView.axaml

@@ -0,0 +1,98 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:OTSSignsOrchestrator.Desktop.ViewModels"
+             x:Class="OTSSignsOrchestrator.Desktop.Views.InstancesView"
+             x:DataType="vm:InstancesViewModel">
+
+    <DockPanel>
+        <!-- Toolbar -->
+        <StackPanel DockPanel.Dock="Top" Spacing="8" Margin="0,0,0,12">
+            <StackPanel Orientation="Horizontal" Spacing="8">
+                <ComboBox ItemsSource="{Binding AvailableHosts}"
+                          SelectedItem="{Binding SelectedSshHost}"
+                          PlaceholderText="Select SSH Host..."
+                          Width="250">
+                    <ComboBox.ItemTemplate>
+                        <DataTemplate>
+                            <TextBlock Text="{Binding Label}" />
+                        </DataTemplate>
+                    </ComboBox.ItemTemplate>
+                </ComboBox>
+                <Button Content="List Remote Stacks" Command="{Binding RefreshRemoteStacksCommand}" />
+                <Button Content="Inspect" Command="{Binding InspectInstanceCommand}" />
+                <Button Content="Delete" Command="{Binding DeleteInstanceCommand}" />
+                <Button Content="Refresh" Command="{Binding LoadInstancesCommand}" />
+            </StackPanel>
+
+            <StackPanel Orientation="Horizontal" Spacing="8">
+                <TextBox Text="{Binding FilterText}" Watermark="Filter by name..." Width="250" />
+                <Button Content="Search" Command="{Binding LoadInstancesCommand}" />
+            </StackPanel>
+        </StackPanel>
+
+        <!-- Status -->
+        <TextBlock DockPanel.Dock="Bottom" Text="{Binding StatusMessage}" Margin="0,8,0,0"
+                   FontSize="12" Foreground="#a6adc8" />
+
+        <!-- Services panel (shown when inspecting) -->
+        <Border DockPanel.Dock="Right" Width="350"
+                IsVisible="{Binding SelectedServices.Count}"
+                Background="#1e1e2e" CornerRadius="8" Padding="12" Margin="12,0,0,0">
+            <StackPanel Spacing="4">
+                <TextBlock Text="Stack Services" FontWeight="SemiBold" Margin="0,0,0,8" />
+                <ItemsControl ItemsSource="{Binding SelectedServices}">
+                    <ItemsControl.ItemTemplate>
+                        <DataTemplate>
+                            <Border Background="#313244" CornerRadius="4" Padding="8" Margin="0,2">
+                                <StackPanel Spacing="2">
+                                    <TextBlock Text="{Binding Name}" FontWeight="SemiBold" />
+                                    <TextBlock Text="{Binding Image}" FontSize="11" Foreground="#a6adc8" />
+                                    <TextBlock Text="{Binding Replicas, StringFormat='Replicas: {0}'}"
+                                               FontSize="11" Foreground="#a6adc8" />
+                                </StackPanel>
+                            </Border>
+                        </DataTemplate>
+                    </ItemsControl.ItemTemplate>
+                </ItemsControl>
+            </StackPanel>
+        </Border>
+
+        <!-- Remote stacks panel -->
+        <Border DockPanel.Dock="Bottom" MaxHeight="200"
+                IsVisible="{Binding RemoteStacks.Count}"
+                Background="#1e1e2e" CornerRadius="8" Padding="12" Margin="0,8,0,0">
+            <StackPanel Spacing="4">
+                <TextBlock Text="Remote Stacks" FontWeight="SemiBold" />
+                <ItemsControl ItemsSource="{Binding RemoteStacks}">
+                    <ItemsControl.ItemTemplate>
+                        <DataTemplate>
+                            <TextBlock>
+                                <Run Text="{Binding Name}" FontWeight="SemiBold" />
+                                <Run Text="{Binding ServiceCount, StringFormat=' ({0} services)'}"
+                                     Foreground="#a6adc8" />
+                            </TextBlock>
+                        </DataTemplate>
+                    </ItemsControl.ItemTemplate>
+                </ItemsControl>
+            </StackPanel>
+        </Border>
+
+        <!-- Instance list -->
+        <DataGrid ItemsSource="{Binding Instances}"
+                  SelectedItem="{Binding SelectedInstance}"
+                  AutoGenerateColumns="False"
+                  IsReadOnly="True"
+                  GridLinesVisibility="Horizontal"
+                  CanUserResizeColumns="True">
+            <DataGrid.Columns>
+                <DataGridTextColumn Header="Stack" Binding="{Binding StackName}" Width="120" />
+                <DataGridTextColumn Header="Customer" Binding="{Binding CustomerName}" Width="120" />
+                <DataGridTextColumn Header="Status" Binding="{Binding Status}" Width="80" />
+                <DataGridTextColumn Header="Server" Binding="{Binding CmsServerName}" Width="150" />
+                <DataGridTextColumn Header="Port" Binding="{Binding HostHttpPort}" Width="60" />
+                <DataGridTextColumn Header="Host" Binding="{Binding SshHost.Label}" Width="120" />
+                <DataGridTextColumn Header="Created" Binding="{Binding CreatedAt, StringFormat='{}{0:g}'}" Width="140" />
+            </DataGrid.Columns>
+        </DataGrid>
+    </DockPanel>
+</UserControl>