feat(app): wire main window, DI services, and demo dataset

src/Vantage.App/DemoData.cs

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+using Vantage.Core.Alerts;
+using Vantage.Core.Logs;
+using Vantage.Core.Models;
+
+namespace Vantage.App;
+
+public static class DemoData
+{
+    public static VantageConfig Build() => new()
+    {
+        RefreshIntervalSeconds = 3,
+        HistoryLength = 120,
+        AlertRules =
+        {
+            new AlertRule { Name = "CPU saturated", Metric = "cpu", Comparison = AlertComparison.GreaterOrEqual, Threshold = 80, For = TimeSpan.FromSeconds(30), Severity = AlertSeverity.Warning },
+            new AlertRule { Name = "Memory pressure", Metric = "memory", Comparison = AlertComparison.GreaterOrEqual, Threshold = 90, For = TimeSpan.FromMinutes(2), Severity = AlertSeverity.Critical },
+            new AlertRule { Name = "Disk almost full", Metric = "disk", Comparison = AlertComparison.GreaterOrEqual, Threshold = 90, For = TimeSpan.Zero, Severity = AlertSeverity.Critical }
+        },
+        LogSources =
+        {
+            LogSource.Journal("docker", "Docker"),
+            LogSource.Journal("ssh", "SSH"),
+            LogSource.File("/var/log/syslog", "syslog")
+        },
+        Hosts =
+        {
+            new HostConfig { Name = "edge-01", Address = "10.10.0.11", Username = "root", AuthMethod = SshAuthMethod.PrivateKey, PrivateKeyPath = "~/.ssh/id_ed25519" },
+            new HostConfig { Name = "storage-01", Address = "10.10.0.21", Username = "ops", AuthMethod = SshAuthMethod.PrivateKey, PrivateKeyPath = "~/.ssh/id_ed25519" },
+            new HostConfig { Name = "vps-main", Address = "vps.example.net", Username = "deploy", AuthMethod = SshAuthMethod.PrivateKey, PrivateKeyPath = "~/.ssh/id_ed25519" }
+        },
+        HealthChecks =
+        {
+            new HealthCheckConfig { Name = "Gateway HTTP", Kind = HealthKind.Http, Target = "https://example.com" },
+            new HealthCheckConfig { Name = "Local SSH", Kind = HealthKind.Tcp, Target = "127.0.0.1:22" },
+            new HealthCheckConfig { Name = "DNS TCP", Kind = HealthKind.Tcp, Target = "1.1.1.1:53" }
+        }
+    };
+}

src/Vantage.App/VantageAppServices.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Vantage.App.ViewModels;
+using Vantage.Core;
+
+namespace Vantage.App;
+
+public static class VantageAppServices
+{
+    public static IServiceCollection AddVantageApp(this IServiceCollection services, bool useMockProviders) =>
+        services.AddVantageApp(useMockProviders ? VantageProviderMode.Mock : VantageProviderMode.Ssh);
+
+    public static IServiceCollection AddVantageApp(this IServiceCollection services, VantageProviderMode mode)
+    {
+        services.AddVantageCore(mode);
+        services.AddTransient<MainWindowViewModel>();
+        return services;
+    }
+
+    public static bool ResolveMockMode() => ResolveProviderMode() == VantageProviderMode.Mock;
+
+    public static VantageProviderMode ResolveProviderMode()
+    {
+        var mode = Environment.GetEnvironmentVariable("VANTAGE_PROVIDERS");
+        return mode?.ToLowerInvariant() switch
+        {
+            "ssh" => VantageProviderMode.Ssh,
+            "prometheus" => VantageProviderMode.Prometheus,
+            _ => VantageProviderMode.Mock
+        };
+    }
+}

src/Vantage.App/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="clr-namespace:Vantage.App.ViewModels"
+        xmlns:views="clr-namespace:Vantage.App.Views"
+        xmlns:conv="clr-namespace:Vantage.App.Converters"
+        mc:Ignorable="d"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        x:Class="Vantage.App.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel"
+        x:CompileBindings="True"
+        Width="1080" Height="720"
+        MinWidth="820" MinHeight="560"
+        Background="#12151B"
+        Title="Vantage - homelab dashboard">
+
+  <Grid ColumnDefinitions="260,*" RowDefinitions="*,Auto">
+
+    <Border Grid.Row="0" Grid.Column="0" Background="#161A22" BorderBrush="#2C323D" BorderThickness="0,0,1,0">
+      <Grid RowDefinitions="Auto,*">
+        <StackPanel Grid.Row="0" Margin="16,16,16,8" Spacing="2">
+          <TextBlock Text="VANTAGE" FontSize="18" FontWeight="Bold" Foreground="{DynamicResource AccentBrush}" />
+          <TextBlock Text="Hosts" Foreground="#8891A0" FontSize="12" />
+        </StackPanel>
+
+        <ListBox Grid.Row="1" ItemsSource="{Binding Hosts}" SelectedItem="{Binding SelectedHost}"
+                 Background="Transparent" Margin="8,0">
+          <ListBox.ItemTemplate>
+            <DataTemplate x:DataType="vm:HostViewModel">
+              <Grid ColumnDefinitions="Auto,*" Margin="4,6">
+                <Ellipse Grid.Column="0" Width="10" Height="10" VerticalAlignment="Center" Margin="0,0,10,0"
+                         Fill="{Binding IsOnline, Converter={x:Static conv:StateBrushConverters.RunningBrush}}" />
+                <StackPanel Grid.Column="1">
+                  <TextBlock Text="{Binding Name}" FontWeight="SemiBold" />
+                  <TextBlock Text="{Binding Endpoint}" Foreground="#8891A0" FontSize="11" />
+                </StackPanel>
+              </Grid>
+            </DataTemplate>
+          </ListBox.ItemTemplate>
+        </ListBox>
+      </Grid>
+    </Border>
+
+    <Grid Grid.Row="0" Grid.Column="1" RowDefinitions="Auto,*" Margin="16">
+      <DockPanel Grid.Row="0" Margin="0,0,0,12">
+        <Button DockPanel.Dock="Right" Content="Refresh now" Command="{Binding RefreshSelectedHostCommand}" />
+        <StackPanel Orientation="Horizontal" Spacing="8" VerticalAlignment="Center">
+          <TextBlock Text="Monitoring" Foreground="#8891A0" VerticalAlignment="Center" />
+          <Ellipse Width="9" Height="9" VerticalAlignment="Center"
+                   Fill="{Binding IsMonitoring, Converter={x:Static conv:StateBrushConverters.RunningBrush}}" />
+        </StackPanel>
+      </DockPanel>
+
+      <TabControl Grid.Row="1">
+        <TabItem Header="Fleet">
+          <views:FleetView DataContext="{Binding}" />
+        </TabItem>
+        <TabItem Header="Host">
+          <views:HostMetricsView DataContext="{Binding SelectedHost}" />
+        </TabItem>
+        <TabItem Header="Alerts">
+          <views:AlertsView DataContext="{Binding}" />
+        </TabItem>
+        <TabItem Header="Docker">
+          <views:DockerView DataContext="{Binding Docker}" />
+        </TabItem>
+        <TabItem Header="Health">
+          <views:HealthView DataContext="{Binding}" />
+        </TabItem>
+      </TabControl>
+    </Grid>
+
+    <Border Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" Background="#161A22" BorderBrush="#2C323D" BorderThickness="0,1,0,0" Padding="16,6">
+      <TextBlock Text="{Binding StatusLine}" Foreground="#8891A0" FontSize="12" />
+    </Border>
+
+  </Grid>
+</Window>

src/Vantage.App/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Vantage.App.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow() => AvaloniaXamlLoader.Load(this);
+}