feat(domain): add domain entities and enums

src/IncidentOps.Domain/Entities/Incident.cs

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+using IncidentOps.Domain.Enums;
+
+namespace IncidentOps.Domain.Entities;
+
+public class Incident
+{
+    public Guid Id { get; set; }
+    public Guid OrgId { get; set; }
+    public Guid ServiceId { get; set; }
+    public required string Title { get; set; }
+    public string? Description { get; set; }
+    public IncidentStatus Status { get; set; }
+    public int Version { get; set; }
+    public Guid? AssignedToUserId { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? AcknowledgedAt { get; set; }
+    public DateTime? MitigatedAt { get; set; }
+    public DateTime? ResolvedAt { get; set; }
+}

src/IncidentOps.Domain/Entities/IncidentEvent.cs

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+using IncidentOps.Domain.Enums;
+
+namespace IncidentOps.Domain.Entities;
+
+public class IncidentEvent
+{
+    public Guid Id { get; set; }
+    public Guid IncidentId { get; set; }
+    public IncidentEventType EventType { get; set; }
+    public Guid? ActorUserId { get; set; }
+    public string? Payload { get; set; }
+    public DateTime CreatedAt { get; set; }
+}

src/IncidentOps.Domain/Entities/NotificationAttempt.cs

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+namespace IncidentOps.Domain.Entities;
+
+public class NotificationAttempt
+{
+    public Guid Id { get; set; }
+    public Guid IncidentId { get; set; }
+    public Guid TargetId { get; set; }
+    public bool Success { get; set; }
+    public string? ErrorMessage { get; set; }
+    public int AttemptNumber { get; set; }
+    public DateTime CreatedAt { get; set; }
+}

src/IncidentOps.Domain/Entities/NotificationTarget.cs

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+using IncidentOps.Domain.Enums;
+
+namespace IncidentOps.Domain.Entities;
+
+public class NotificationTarget
+{
+    public Guid Id { get; set; }
+    public Guid OrgId { get; set; }
+    public required string Name { get; set; }
+    public NotificationTargetType TargetType { get; set; }
+    public required string Configuration { get; set; }
+    public bool IsEnabled { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+}

src/IncidentOps.Domain/Entities/Org.cs

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+namespace IncidentOps.Domain.Entities;
+
+public class Org
+{
+    public Guid Id { get; set; }
+    public required string Name { get; set; }
+    public required string Slug { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+}

src/IncidentOps.Domain/Entities/OrgMember.cs

@@ -0,0 +1,13 @@
+using IncidentOps.Domain.Enums;
+
+namespace IncidentOps.Domain.Entities;
+
+public class OrgMember
+{
+    public Guid Id { get; set; }
+    public Guid OrgId { get; set; }
+    public Guid UserId { get; set; }
+    public OrgRole Role { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+}

src/IncidentOps.Domain/Entities/RefreshToken.cs

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+namespace IncidentOps.Domain.Entities;
+
+public class RefreshToken
+{
+    public Guid Id { get; set; }
+    public Guid UserId { get; set; }
+    public required string TokenHash { get; set; }
+    public Guid ActiveOrgId { get; set; }
+    public DateTime ExpiresAt { get; set; }
+    public DateTime? RevokedAt { get; set; }
+    public DateTime CreatedAt { get; set; }
+}

src/IncidentOps.Domain/Entities/Service.cs

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+namespace IncidentOps.Domain.Entities;
+
+public class Service
+{
+    public Guid Id { get; set; }
+    public Guid OrgId { get; set; }
+    public required string Name { get; set; }
+    public required string Slug { get; set; }
+    public string? Description { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+}

src/IncidentOps.Domain/Entities/User.cs

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+namespace IncidentOps.Domain.Entities;
+
+public class User
+{
+    public Guid Id { get; set; }
+    public required string Email { get; set; }
+    public required string PasswordHash { get; set; }
+    public required string DisplayName { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+}

src/IncidentOps.Domain/Enums/IncidentEventType.cs

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+namespace IncidentOps.Domain.Enums;
+
+public enum IncidentEventType
+{
+    Created,
+    Acknowledged,
+    Mitigated,
+    Resolved,
+    Comment,
+    NotificationSent,
+    NotificationFailed,
+    EscalationTriggered
+}

src/IncidentOps.Domain/Enums/IncidentStatus.cs

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+namespace IncidentOps.Domain.Enums;
+
+public enum IncidentStatus
+{
+    Triggered,
+    Acknowledged,
+    Mitigated,
+    Resolved
+}

src/IncidentOps.Domain/Enums/NotificationTargetType.cs

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+namespace IncidentOps.Domain.Enums;
+
+public enum NotificationTargetType
+{
+    Webhook,
+    Email,
+    Slack
+}

src/IncidentOps.Domain/Enums/OrgRole.cs

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+namespace IncidentOps.Domain.Enums;
+
+public enum OrgRole
+{
+    Viewer,
+    Member,
+    Admin
+}

src/IncidentOps.Domain/IncidentOps.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="..\IncidentOps.Contracts\IncidentOps.Contracts.csproj" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>