feat(core): add host, alert, and metrics domain models

src/Vantage.Core/Models/DockerContainer.cs

@@ -0,0 +1,23 @@
+namespace Vantage.Core.Models;
+
+public enum ContainerState
+{
+    Running,
+    Exited,
+    Paused,
+    Restarting,
+    Created,
+    Dead,
+    Other
+}
+
+public sealed record DockerContainer
+{
+    public string Id { get; init; } = "";
+    public string Name { get; init; } = "";
+    public string Image { get; init; } = "";
+    public ContainerState State { get; init; } = ContainerState.Other;
+    public string StatusText { get; init; } = "";
+
+    public bool IsRunning => State == ContainerState.Running;
+}

src/Vantage.Core/Models/HealthCheck.cs

@@ -0,0 +1,43 @@
+namespace Vantage.Core.Models;
+
+public enum HealthKind
+{
+    Http,
+    Tcp
+}
+
+public enum HealthStatus
+{
+    Unknown,
+    Up,
+    Degraded,
+    Down
+}
+
+public sealed class HealthCheckConfig
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString("N");
+    public string Name { get; set; } = "";
+    public HealthKind Kind { get; set; } = HealthKind.Http;
+    public string Target { get; set; } = "";
+    public int TimeoutMs { get; set; } = 5000;
+    public int ExpectedStatusMin { get; set; } = 200;
+    public int ExpectedStatusMax { get; set; } = 399;
+}
+
+public sealed record HealthCheckResult
+{
+    public HealthStatus Status { get; init; } = HealthStatus.Unknown;
+    public double? LatencyMs { get; init; }
+    public string Message { get; init; } = "";
+    public DateTimeOffset CheckedAt { get; init; } = DateTimeOffset.UtcNow;
+
+    public static HealthCheckResult Up(double latencyMs, string message) =>
+        new() { Status = HealthStatus.Up, LatencyMs = latencyMs, Message = message };
+
+    public static HealthCheckResult Degraded(double latencyMs, string message) =>
+        new() { Status = HealthStatus.Degraded, LatencyMs = latencyMs, Message = message };
+
+    public static HealthCheckResult Down(string message) =>
+        new() { Status = HealthStatus.Down, Message = message };
+}

src/Vantage.Core/Models/HostConfig.cs

@@ -0,0 +1,28 @@
+namespace Vantage.Core.Models;
+
+public enum SshAuthMethod
+{
+    PrivateKey,
+    Password,
+    Agent
+}
+
+public sealed class HostConfig
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString("N");
+    public string Name { get; set; } = "";
+    public string Address { get; set; } = "";
+    public int Port { get; set; } = 22;
+    public string Username { get; set; } = "";
+    public SshAuthMethod AuthMethod { get; set; } = SshAuthMethod.PrivateKey;
+    public string? PrivateKeyPath { get; set; }
+    public string? PrivateKeyPassphrase { get; set; }
+    public string? Password { get; set; }
+    public string DiskMount { get; set; } = "/";
+    public string? MetricsEndpoint { get; set; }
+
+    public string ResolveMetricsEndpoint() =>
+        string.IsNullOrWhiteSpace(MetricsEndpoint)
+            ? $"http://{Address}:9100/metrics"
+            : MetricsEndpoint;
+}

src/Vantage.Core/Models/HostMetrics.cs

@@ -0,0 +1,21 @@
+namespace Vantage.Core.Models;
+
+public sealed record HostMetrics
+{
+    public double CpuUsagePercent { get; init; }
+    public long MemoryUsedBytes { get; init; }
+    public long MemoryTotalBytes { get; init; }
+    public long DiskUsedBytes { get; init; }
+    public long DiskTotalBytes { get; init; }
+    public double Load1 { get; init; }
+    public double Load5 { get; init; }
+    public double Load15 { get; init; }
+    public TimeSpan Uptime { get; init; }
+    public DateTimeOffset CollectedAt { get; init; } = DateTimeOffset.UtcNow;
+
+    public double MemoryUsedPercent =>
+        MemoryTotalBytes <= 0 ? 0 : Math.Round(100.0 * MemoryUsedBytes / MemoryTotalBytes, 1);
+
+    public double DiskUsedPercent =>
+        DiskTotalBytes <= 0 ? 0 : Math.Round(100.0 * DiskUsedBytes / DiskTotalBytes, 1);
+}

src/Vantage.Core/Models/VantageConfig.cs

@@ -0,0 +1,16 @@
+using Vantage.Core.Alerts;
+using Vantage.Core.Logs;
+
+namespace Vantage.Core.Models;
+
+public sealed class VantageConfig
+{
+    public List<HostConfig> Hosts { get; set; } = new();
+    public List<HealthCheckConfig> HealthChecks { get; set; } = new();
+    public List<AlertRule> AlertRules { get; set; } = new();
+    public List<LogSource> LogSources { get; set; } = new();
+    public int RefreshIntervalSeconds { get; set; } = 5;
+    public int HistoryLength { get; set; } = 120;
+    public int HistoryRetentionHours { get; set; } = 168;
+    public string? AlertWebhookUrl { get; set; }
+}