Add unit tests for RabbitMq and Udp transport servers and clients

- Implemented comprehensive unit tests for RabbitMqTransportServer, covering constructor, disposal, connection management, event handlers, and exception handling.
- Added configuration tests for RabbitMqTransportServer to validate SSL, durable queues, auto-recovery, and custom virtual host options.
- Created unit tests for UdpFrameProtocol, including frame parsing and serialization, header size validation, and round-trip data preservation.
- Developed tests for UdpTransportClient, focusing on connection handling, event subscriptions, and exception scenarios.
- Established tests for UdpTransportServer, ensuring proper start/stop behavior, connection state management, and event handling.
- Included tests for UdpTransportOptions to verify default values and modification capabilities.
- Enhanced service registration tests for Udp transport services in the dependency injection container.

src/__Libraries/StellaOps.Router.Common/Models/ConnectionState.cs

@@ -41,4 +41,15 @@ public sealed class ConnectionState
     /// Gets the transport type used for this connection.
     /// </summary>
     public required TransportType TransportType { get; init; }
+
+    /// <summary>
+    /// Gets the schema definitions for this connection's service.
+    /// Keys are schema IDs referenced by EndpointDescriptor.SchemaInfo.
+    /// </summary>
+    public IReadOnlyDictionary<string, SchemaDefinition> Schemas { get; init; } = new Dictionary<string, SchemaDefinition>();
+
+    /// <summary>
+    /// Gets the OpenAPI metadata for this connection's service.
+    /// </summary>
+    public ServiceOpenApiInfo? OpenApiInfo { get; init; }
 }

src/__Libraries/StellaOps.Router.Common/Models/EndpointDescriptor.cs

@@ -45,4 +45,10 @@ public sealed record EndpointDescriptor
     /// This is used by the Microservice SDK for handler resolution.
     /// </summary>
     public Type? HandlerType { get; init; }
+
+    /// <summary>
+    /// Gets the schema information for this endpoint.
+    /// Contains references to request/response schemas and OpenAPI documentation.
+    /// </summary>
+    public EndpointSchemaInfo? SchemaInfo { get; init; }
 }

src/__Libraries/StellaOps.Router.Common/Models/EndpointSchemaInfo.cs

@@ -0,0 +1,39 @@
+namespace StellaOps.Router.Common.Models;
+
+/// <summary>
+/// Schema metadata for an endpoint, referencing schemas by ID.
+/// </summary>
+public sealed record EndpointSchemaInfo
+{
+    /// <summary>
+    /// Gets the schema ID for request validation.
+    /// References a key in HelloPayload.Schemas.
+    /// </summary>
+    public string? RequestSchemaId { get; init; }
+
+    /// <summary>
+    /// Gets the schema ID for response validation.
+    /// References a key in HelloPayload.Schemas.
+    /// </summary>
+    public string? ResponseSchemaId { get; init; }
+
+    /// <summary>
+    /// Gets the OpenAPI operation summary.
+    /// </summary>
+    public string? Summary { get; init; }
+
+    /// <summary>
+    /// Gets the OpenAPI operation description.
+    /// </summary>
+    public string? Description { get; init; }
+
+    /// <summary>
+    /// Gets the OpenAPI tags for this endpoint.
+    /// </summary>
+    public IReadOnlyList<string> Tags { get; init; } = [];
+
+    /// <summary>
+    /// Gets a value indicating whether this endpoint is deprecated.
+    /// </summary>
+    public bool Deprecated { get; init; }
+}

src/__Libraries/StellaOps.Router.Common/Models/HelloPayload.cs

@@ -14,4 +14,15 @@ public sealed record HelloPayload
     /// Gets the endpoints registered by this instance.
     /// </summary>
     public required IReadOnlyList<EndpointDescriptor> Endpoints { get; init; }
+
+    /// <summary>
+    /// Gets the schema definitions for request/response validation.
+    /// Keys are schema IDs referenced by EndpointDescriptor.SchemaInfo.
+    /// </summary>
+    public IReadOnlyDictionary<string, SchemaDefinition> Schemas { get; init; } = new Dictionary<string, SchemaDefinition>();
+
+    /// <summary>
+    /// Gets the OpenAPI metadata for this service.
+    /// </summary>
+    public ServiceOpenApiInfo? OpenApiInfo { get; init; }
 }

src/__Libraries/StellaOps.Router.Common/Models/SchemaDefinition.cs

@@ -0,0 +1,22 @@
+namespace StellaOps.Router.Common.Models;
+
+/// <summary>
+/// A JSON Schema definition for request or response validation.
+/// </summary>
+public sealed record SchemaDefinition
+{
+    /// <summary>
+    /// Gets the unique schema identifier (e.g., "CreateInvoiceRequest").
+    /// </summary>
+    public required string SchemaId { get; init; }
+
+    /// <summary>
+    /// Gets the JSON Schema document (draft 2020-12 compatible).
+    /// </summary>
+    public required string SchemaJson { get; init; }
+
+    /// <summary>
+    /// Gets the ETag for cache validation (SHA256 truncated).
+    /// </summary>
+    public string? ETag { get; init; }
+}

src/__Libraries/StellaOps.Router.Common/Models/ServiceOpenApiInfo.cs

@@ -0,0 +1,27 @@
+namespace StellaOps.Router.Common.Models;
+
+/// <summary>
+/// OpenAPI metadata for a microservice.
+/// </summary>
+public sealed record ServiceOpenApiInfo
+{
+    /// <summary>
+    /// Gets the service title for OpenAPI info.
+    /// </summary>
+    public string? Title { get; init; }
+
+    /// <summary>
+    /// Gets the service description for OpenAPI info.
+    /// </summary>
+    public string? Description { get; init; }
+
+    /// <summary>
+    /// Gets the contact information for the service.
+    /// </summary>
+    public string? Contact { get; init; }
+
+    /// <summary>
+    /// Gets the license name for the service.
+    /// </summary>
+    public string? License { get; init; }
+}