feat(backend): Implement Story 5.5 - Core MCP Resources Implementation

Implemented 6 core MCP Resources for read-only AI agent access to ColaFlow data:
- projects.list - List all projects in current tenant
- projects.get/{id} - Get project details with full hierarchy
- issues.search - Search issues (Epics, Stories, Tasks) with filters
- issues.get/{id} - Get issue details (Epic/Story/Task)
- sprints.current - Get currently active Sprint(s)
- users.list - List team members in current tenant

Changes:
- Created IMcpResource interface and related DTOs (McpResourceRequest, McpResourceContent, McpResourceDescriptor)
- Implemented IMcpResourceRegistry and McpResourceRegistry for resource discovery and routing
- Created ResourcesReadMethodHandler for handling resources/read MCP method
- Updated ResourcesListMethodHandler to return actual resource catalog
- Implemented 6 concrete resource classes with multi-tenant isolation
- Registered all resources and handlers in McpServiceExtensions
- Added module references (ProjectManagement, Identity, IssueManagement domains)
- Updated package versions to 9.0.1 for consistency
- Created comprehensive unit tests (188 tests passing)
- Tests cover resource registry, URI matching, resource content generation

Technical Details:
- Multi-tenant isolation using TenantContext.GetCurrentTenantId()
- Resource URI routing supports templates (e.g., {id} parameters)
- Uses read-only repository queries (AsNoTracking) for performance
- JSON serialization with System.Text.Json
- Proper error handling with McpNotFoundException, McpInvalidParamsException
- Supports query parameters for filtering and pagination
- Auto-registration of resources at startup

Test Coverage:
- Resource registry tests (URI matching, registration, descriptors)
- Resource content generation tests
- Multi-tenant isolation verification
- All 188 tests passing

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

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

colaflow-api/src/Modules/Mcp/ColaFlow.Modules.Mcp.Infrastructure/Extensions/McpServiceExtensions.cs

@@ -1,5 +1,7 @@
 using ColaFlow.Modules.Mcp.Application.Handlers;
+using ColaFlow.Modules.Mcp.Application.Resources;
 using ColaFlow.Modules.Mcp.Application.Services;
+using ColaFlow.Modules.Mcp.Contracts.Resources;
 using ColaFlow.Modules.Mcp.Domain.Repositories;
 using ColaFlow.Modules.Mcp.Infrastructure.Middleware;
 using ColaFlow.Modules.Mcp.Infrastructure.Persistence;
@@ -34,12 +36,24 @@ public static class McpServiceExtensions
         // Register application services
         services.AddScoped<IMcpApiKeyService, McpApiKeyService>();
 
+        // Register resource registry (Singleton - shared across all requests)
+        services.AddSingleton<IMcpResourceRegistry, McpResourceRegistry>();
+
+        // Register MCP Resources
+        services.AddScoped<IMcpResource, ProjectsListResource>();
+        services.AddScoped<IMcpResource, ProjectsGetResource>();
+        services.AddScoped<IMcpResource, IssuesSearchResource>();
+        services.AddScoped<IMcpResource, IssuesGetResource>();
+        services.AddScoped<IMcpResource, SprintsCurrentResource>();
+        services.AddScoped<IMcpResource, UsersListResource>();
+
         // Register protocol handler
         services.AddScoped<IMcpProtocolHandler, McpProtocolHandler>();
 
         // Register method handlers
         services.AddScoped<IMcpMethodHandler, InitializeMethodHandler>();
         services.AddScoped<IMcpMethodHandler, ResourcesListMethodHandler>();
+        services.AddScoped<IMcpMethodHandler, ResourcesReadMethodHandler>();
         services.AddScoped<IMcpMethodHandler, ToolsListMethodHandler>();
         services.AddScoped<IMcpMethodHandler, ToolsCallMethodHandler>();
 
@@ -57,6 +71,9 @@ public static class McpServiceExtensions
     /// </summary>
     public static IApplicationBuilder UseMcpMiddleware(this IApplicationBuilder app)
     {
+        // Initialize resource registry (register all resources)
+        InitializeResourceRegistry(app);
+
         // 1. Correlation ID middleware (FIRST - needed for all subsequent logging)
         app.UseMiddleware<McpCorrelationIdMiddleware>();
 
@@ -74,4 +91,20 @@ public static class McpServiceExtensions
 
         return app;
     }
+
+    /// <summary>
+    /// Initialize resource registry by registering all resources
+    /// This is called once at startup
+    /// </summary>
+    private static void InitializeResourceRegistry(IApplicationBuilder app)
+    {
+        using var scope = app.ApplicationServices.CreateScope();
+        var registry = scope.ServiceProvider.GetRequiredService<IMcpResourceRegistry>();
+        var resources = scope.ServiceProvider.GetServices<IMcpResource>();
+
+        foreach (var resource in resources)
+        {
+            registry.RegisterResource(resource);
+        }
+    }
 }