feat(FRACT-710): Implement GraphQL ConnectionType ServiceType

Add complete GraphQL connection implementation following ServiceTypeOption pattern:
- New project: Services.Connections.GraphQL
- GraphQLConnectionConfiguration with GraphQL-specific options
- GraphQLProtocol TypeOption for HttpProtocols collection
- IGraphQLConnectionFactory interface
- GraphQLConnectionFactory using HttpConnection internally
- GraphQLConnectionType as ServiceTypeOption for ConnectionTypes
- GraphQLDataCommandTranslator for query/mutation translation
- GraphQLServiceLogger for connection logging

GraphQL connections use POST requests with JSON payloads containing
GraphQL operations, supporting queries, mutations, and basic introspection.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Mike

src/FractalDataWorks.Services.Connections.GraphQL/FractalDataWorks.Services.Connections.GraphQL.csproj

@@ -0,0 +1,34 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <!-- Enable generator debugging -->
+    <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
+    <CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)generated</CompilerGeneratedFilesOutputPath>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\FractalDataWorks.Collections.SourceGenerators\FractalDataWorks.Collections.SourceGenerators.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
+    <ProjectReference Include="..\FractalDataWorks.Configuration.SourceGenerators\FractalDataWorks.Configuration.SourceGenerators.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" PrivateAssets="all" />
+    <ProjectReference Include="..\FractalDataWorks.Configuration.Persistence\FractalDataWorks.Configuration.Persistence.csproj" />
+    <ProjectReference Include="..\FractalDataWorks.MessageLogging.Abstractions\FractalDataWorks.MessageLogging.Abstractions.csproj" />
+    <ProjectReference Include="..\FractalDataWorks.MessageLogging.SourceGenerators\FractalDataWorks.MessageLogging.SourceGenerators.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
+    <ProjectReference Include="..\FractalDataWorks.Services.Connections.Abstractions\FractalDataWorks.Services.Connections.Abstractions.csproj" />
+    <ProjectReference Include="..\FractalDataWorks.Services.Connections.Http.Abstractions\FractalDataWorks.Services.Connections.Http.Abstractions.csproj" />
+    <ProjectReference Include="..\FractalDataWorks.Services.Connections.Http\FractalDataWorks.Services.Connections.Http.csproj" />
+    <ProjectReference Include="..\FractalDataWorks.Services.Connections\FractalDataWorks.Services.Connections.csproj" />
+    <ProjectReference Include="..\FractalDataWorks.Services\FractalDataWorks.Services.csproj" />
+    <ProjectReference Include="..\FractalDataWorks.Services.Abstractions\FractalDataWorks.Services.Abstractions.csproj" />
+    <ProjectReference Include="..\FractalDataWorks.Data.Abstractions\FractalDataWorks.Data.Abstractions.csproj" />
+    <ProjectReference Include="..\FractalDataWorks.Commands.Data.Abstractions\FractalDataWorks.Commands.Data.Abstractions.csproj" />
+    <ProjectReference Include="..\FractalDataWorks.Commands.Data\FractalDataWorks.Commands.Data.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
+    <PackageReference Include="Microsoft.Extensions.Http" />
+  </ItemGroup>
+
+</Project>

src/FractalDataWorks.Services.Connections.GraphQL/GraphQLConnectionConfiguration.cs

@@ -0,0 +1,111 @@
+using System;
+using System.Collections.Generic;
+using FractalDataWorks.Configuration;
+using FractalDataWorks.Services.Abstractions;
+using FractalDataWorks.Services.Connections.Abstractions;
+
+namespace FractalDataWorks.Services.Connections.GraphQL;
+
+/// <summary>
+/// Configuration class for GraphQL connections.
+/// Provides GraphQL-specific configuration options.
+/// </summary>
+[ManagedConfiguration(
+    Schema = "cfg",
+    TableName = "GraphQLConnection",
+    ServiceCategory = "Connection",
+    ServiceType = "GraphQL")]
+public sealed partial class GraphQLConnectionConfiguration : ConfigurationBase<GraphQLConnectionConfiguration>, IConnectionConfiguration
+{
+    /// <inheritdoc/>
+    public override string SectionName => "GenericConnections:GraphQL";
+
+    /// <inheritdoc/>
+    public string ConnectionType { get; init; } = "GraphQL";
+
+    /// <inheritdoc/>
+    public IServiceLifetime Lifetime { get; init; } = ServiceLifetimes.Scoped;
+
+    /// <inheritdoc/>
+    public string? SecretManagerName { get; init; }
+
+    /// <inheritdoc/>
+    public string? SecretKeyName { get; init; }
+
+    /// <inheritdoc/>
+    public string? AuthenticationName { get; init; }
+
+    /// <summary>
+    /// Gets the base URL for the GraphQL endpoint.
+    /// </summary>
+    public string BaseUrl { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Gets the GraphQL endpoint path.
+    /// Defaults to "/graphql".
+    /// </summary>
+    public string EndpointPath { get; init; } = "/graphql";
+
+    /// <summary>
+    /// Gets the timeout for HTTP requests in seconds.
+    /// </summary>
+    public int TimeoutSeconds { get; init; } = 30;
+
+    /// <summary>
+    /// Gets the default content type for GraphQL requests.
+    /// Defaults to "application/json".
+    /// </summary>
+    public string ContentType { get; init; } = "application/json";
+
+    /// <summary>
+    /// Gets the Accept header value for GraphQL requests.
+    /// Defaults to "application/json".
+    /// </summary>
+    public string AcceptHeader { get; init; } = "application/json";
+
+    /// <summary>
+    /// Gets the User-Agent header value for GraphQL requests.
+    /// </summary>
+    public string UserAgent { get; init; } = "FractalDataWorks-GraphQL-Client/1.0";
+
+    /// <summary>
+    /// Gets additional HTTP headers to include with all requests.
+    /// </summary>
+    public IReadOnlyDictionary<string, string> Headers { get; init; } = new Dictionary<string, string>(StringComparer.Ordinal);
+
+    /// <summary>
+    /// Gets a value indicating whether to enable introspection queries.
+    /// Defaults to true.
+    /// </summary>
+    public bool EnableIntrospection { get; init; } = true;
+
+    /// <summary>
+    /// Gets a value indicating whether to enable batching multiple queries.
+    /// Defaults to false.
+    /// </summary>
+    public bool EnableBatching { get; init; } = false;
+
+    /// <summary>
+    /// Gets the maximum batch size for batched queries.
+    /// Defaults to 10.
+    /// </summary>
+    public int MaxBatchSize { get; init; } = 10;
+
+    /// <summary>
+    /// Gets a value indicating whether to use GET for queries (POST for mutations).
+    /// Defaults to false (use POST for all operations).
+    /// </summary>
+    public bool UseGetForQueries { get; init; } = false;
+
+    /// <summary>
+    /// Gets a value indicating whether to validate SSL certificates.
+    /// Defaults to true for security.
+    /// </summary>
+    public bool ValidateSslCertificate { get; init; } = true;
+
+    /// <summary>
+    /// Gets the WebSocket URL for subscriptions.
+    /// If not set, subscriptions are not supported.
+    /// </summary>
+    public string? WebSocketUrl { get; init; }
+}