feat(backend): Implement Story 5.6 - Resource Registration & Discovery

Implemented pluggable resource registration and auto-discovery mechanism for MCP Resources.

Changes:
- Enhanced McpResourceDescriptor with metadata (Category, Version, Parameters, Examples, Tags, IsEnabled)
- Created ResourceDiscoveryService for Assembly scanning and auto-discovery
- Updated McpResourceRegistry with category support and grouping methods
- Enhanced ResourcesListMethodHandler to return categorized resources with full metadata
- Created ResourceHealthCheckHandler for resource availability verification
- Updated all existing Resources (Projects, Issues, Sprints, Users) with Categories and Versions
- Updated McpServiceExtensions to use auto-discovery at startup
- Added comprehensive unit tests for discovery and health check

Features:
✅ New Resources automatically discovered via Assembly scanning
✅ Resources organized by category (Projects, Issues, Sprints, Users)
✅ Rich metadata for documentation (parameters, examples, tags)
✅ Health check endpoint (resources/health) for monitoring
✅ Thread-safe registry operations

🤖 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

@@ -10,16 +10,18 @@ using Microsoft.AspNetCore.Builder;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
 
 namespace ColaFlow.Modules.Mcp.Infrastructure.Extensions;
 
 /// <summary>
 /// Extension methods for registering MCP services
+/// Enhanced with auto-discovery and dynamic registration
 /// </summary>
 public static class McpServiceExtensions
 {
     /// <summary>
-    /// Registers MCP module services
+    /// Registers MCP module services with auto-discovery
     /// </summary>
     public static IServiceCollection AddMcpModule(this IServiceCollection services, IConfiguration configuration)
     {
@@ -39,7 +41,10 @@ public static class McpServiceExtensions
         // Register resource registry (Singleton - shared across all requests)
         services.AddSingleton<IMcpResourceRegistry, McpResourceRegistry>();
 
-        // Register MCP Resources
+        // Register Resource Discovery Service (Singleton - used at startup)
+        services.AddSingleton<IResourceDiscoveryService, ResourceDiscoveryService>();
+
+        // Register MCP Resources (Scoped - manual registration for now, auto-discovery at startup)
         services.AddScoped<IMcpResource, ProjectsListResource>();
         services.AddScoped<IMcpResource, ProjectsGetResource>();
         services.AddScoped<IMcpResource, IssuesSearchResource>();
@@ -54,6 +59,7 @@ public static class McpServiceExtensions
         services.AddScoped<IMcpMethodHandler, InitializeMethodHandler>();
         services.AddScoped<IMcpMethodHandler, ResourcesListMethodHandler>();
         services.AddScoped<IMcpMethodHandler, ResourcesReadMethodHandler>();
+        services.AddScoped<IMcpMethodHandler, ResourceHealthCheckHandler>(); // NEW: Health check handler
         services.AddScoped<IMcpMethodHandler, ToolsListMethodHandler>();
         services.AddScoped<IMcpMethodHandler, ToolsCallMethodHandler>();
 
@@ -71,7 +77,7 @@ public static class McpServiceExtensions
     /// </summary>
     public static IApplicationBuilder UseMcpMiddleware(this IApplicationBuilder app)
     {
-        // Initialize resource registry (register all resources)
+        // Initialize resource registry (register all resources with auto-discovery)
         InitializeResourceRegistry(app);
 
         // 1. Correlation ID middleware (FIRST - needed for all subsequent logging)
@@ -94,17 +100,30 @@ public static class McpServiceExtensions
 
     /// <summary>
     /// Initialize resource registry by registering all resources
+    /// Enhanced with auto-discovery using Assembly scanning
     /// 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>();
+        var discoveryService = scope.ServiceProvider.GetRequiredService<IResourceDiscoveryService>();
+        var loggerFactory = scope.ServiceProvider.GetRequiredService<ILoggerFactory>();
+        var logger = loggerFactory.CreateLogger("McpResourceRegistry");
 
+        logger.LogInformation("Initializing MCP Resource Registry with auto-discovery...");
+
+        // Auto-discover and instantiate all resources
+        var resources = discoveryService.DiscoverAndInstantiateResources(scope.ServiceProvider);
+
+        // Register all discovered resources
         foreach (var resource in resources)
         {
             registry.RegisterResource(resource);
         }
+
+        var categories = registry.GetCategories();
+        logger.LogInformation("MCP Resource Registry initialized: {ResourceCount} resources in {CategoryCount} categories: {Categories}",
+            resources.Count, categories.Count, string.Join(", ", categories));
     }
 }