feat(backend): Implement complete Project Management Module with multi-tenant support

Day 12 implementation - Complete CRUD operations with tenant isolation and SignalR integration.

**Domain Layer**:
- Added TenantId value object for strong typing
- Updated Project entity to include TenantId field
- Modified Project.Create factory method to require tenantId parameter
- Updated ProjectCreatedEvent to include TenantId

**Application Layer**:
- Created UpdateProjectCommand, Handler, and Validator for project updates
- Created ArchiveProjectCommand, Handler, and Validator for archiving projects
- Updated CreateProjectCommand to include TenantId
- Modified CreateProjectCommandValidator to remove OwnerId validation (set from JWT)
- Created IProjectNotificationService interface for SignalR abstraction
- Implemented ProjectCreatedEventHandler with SignalR notifications
- Implemented ProjectUpdatedEventHandler with SignalR notifications
- Implemented ProjectArchivedEventHandler with SignalR notifications

**Infrastructure Layer**:
- Updated PMDbContext to inject IHttpContextAccessor
- Configured Global Query Filter for automatic tenant isolation
- Added TenantId property mapping in ProjectConfiguration
- Created TenantId index for query performance

**API Layer**:
- Updated ProjectsController with [Authorize] attribute
- Implemented PUT /api/v1/projects/{id} for updates
- Implemented DELETE /api/v1/projects/{id} for archiving
- Added helper methods to extract TenantId and UserId from JWT claims
- Extended IRealtimeNotificationService with Project-specific methods
- Implemented RealtimeNotificationService with tenant-aware SignalR groups
- Created ProjectNotificationServiceAdapter to bridge layers
- Registered IProjectNotificationService in Program.cs

**Features Implemented**:
- Complete CRUD operations (Create, Read, Update, Archive)
- Multi-tenant isolation via EF Core Global Query Filter
- JWT-based authorization on all endpoints
- SignalR real-time notifications for all Project events
- Clean Architecture with proper layer separation
- Domain Event pattern with MediatR

**Database Migration**:
- Migration created (not applied yet): AddTenantIdToProject

**Test Scripts**:
- Created comprehensive test scripts (test-project-simple.ps1)
- Tests cover full CRUD lifecycle and tenant isolation

**Note**: API hot reload required to apply CreateProjectCommandValidator fix.

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

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

colaflow-api/src/Modules/ProjectManagement/ColaFlow.Modules.ProjectManagement.Infrastructure/Persistence/Configurations/ProjectConfiguration.cs

@@ -26,6 +26,13 @@ public class ProjectConfiguration : IEntityTypeConfiguration<Project>
             .IsRequired()
             .ValueGeneratedNever();
 
+        // TenantId conversion
+        builder.Property(p => p.TenantId)
+            .HasConversion(
+                id => id.Value,
+                value => TenantId.From(value))
+            .IsRequired();
+
         // Basic properties
         builder.Property(p => p.Name)
             .HasMaxLength(200)
@@ -77,6 +84,7 @@ public class ProjectConfiguration : IEntityTypeConfiguration<Project>
         // Indexes for performance
         builder.HasIndex(p => p.CreatedAt);
         builder.HasIndex(p => p.OwnerId);
+        builder.HasIndex(p => p.TenantId);
 
         // Ignore DomainEvents (handled separately)
         builder.Ignore(p => p.DomainEvents);

colaflow-api/src/Modules/ProjectManagement/ColaFlow.Modules.ProjectManagement.Infrastructure/Persistence/PMDbContext.cs

@@ -1,14 +1,24 @@
 using System.Reflection;
+using Microsoft.AspNetCore.Http;
 using Microsoft.EntityFrameworkCore;
 using ColaFlow.Modules.ProjectManagement.Domain.Aggregates.ProjectAggregate;
+using ColaFlow.Modules.ProjectManagement.Domain.ValueObjects;
 
 namespace ColaFlow.Modules.ProjectManagement.Infrastructure.Persistence;
 
 /// <summary>
 /// Project Management Module DbContext
 /// </summary>
-public class PMDbContext(DbContextOptions<PMDbContext> options) : DbContext(options)
+public class PMDbContext : DbContext
 {
+    private readonly IHttpContextAccessor _httpContextAccessor;
+
+    public PMDbContext(DbContextOptions<PMDbContext> options, IHttpContextAccessor httpContextAccessor)
+        : base(options)
+    {
+        _httpContextAccessor = httpContextAccessor;
+    }
+
     public DbSet<Project> Projects => Set<Project>();
     public DbSet<Epic> Epics => Set<Epic>();
     public DbSet<Story> Stories => Set<Story>();
@@ -23,5 +33,24 @@ public class PMDbContext(DbContextOptions<PMDbContext> options) : DbContext(opti
 
         // Apply all entity configurations from this assembly
         modelBuilder.ApplyConfigurationsFromAssembly(Assembly.GetExecutingAssembly());
+
+        // Multi-tenant Global Query Filter for Project
+        modelBuilder.Entity<Project>().HasQueryFilter(p =>
+            p.TenantId == GetCurrentTenantId());
+    }
+
+    private TenantId GetCurrentTenantId()
+    {
+        var tenantIdClaim = _httpContextAccessor?.HttpContext?.User
+            .FindFirst("tenant_id")?.Value;
+
+        if (Guid.TryParse(tenantIdClaim, out var tenantId) && tenantId != Guid.Empty)
+        {
+            return TenantId.From(tenantId);
+        }
+
+        // Return a dummy value for queries outside HTTP context (e.g., migrations)
+        // These will return no results due to the filter
+        return TenantId.From(Guid.Empty);
     }
 }