feat: add WebSocket module for real-time functionalities

- Implemented `WebSocketsGateway` for handling Socket.IO connections, events, and rooms.
- Added `WebSocketsService` to act as a facade for emitting WebSocket events (projects, groups, notifications).
- Registered `WebSocketsModule` and integrated it into `AppModule`.
- Enabled real-time updates in `ProjectsService` and `GroupsService` with relevant WebSocket events (create, update, delete, collaborator/group actions).

backend/src/modules/projects/services/projects.service.ts

@@ -4,10 +4,14 @@ import { DRIZZLE } from '../../../database/database.module';
 import * as schema from '../../../database/schema';
 import { CreateProjectDto } from '../dto/create-project.dto';
 import { UpdateProjectDto } from '../dto/update-project.dto';
+import { WebSocketsService } from '../../websockets/websockets.service';
 
 @Injectable()
 export class ProjectsService {
-  constructor(@Inject(DRIZZLE) private readonly db: any) {}
+  constructor(
+    @Inject(DRIZZLE) private readonly db: any,
+    private readonly websocketsService: WebSocketsService,
+  ) {}
 
   /**
    * Create a new project
@@ -17,6 +21,13 @@ export class ProjectsService {
       .insert(schema.projects)
       .values(createProjectDto)
       .returning();
+
+    // Emit project created event
+    this.websocketsService.emitProjectUpdated(project.id, {
+      action: 'created',
+      project,
+    });
+
     return project;
   }
 
@@ -70,6 +81,12 @@ export class ProjectsService {
       throw new NotFoundException(`Project with ID ${id} not found`);
     }
 
+    // Emit project updated event
+    this.websocketsService.emitProjectUpdated(project.id, {
+      action: 'updated',
+      project,
+    });
+
     return project;
   }
 
@@ -86,6 +103,12 @@ export class ProjectsService {
       throw new NotFoundException(`Project with ID ${id} not found`);
     }
 
+    // Emit project deleted event
+    this.websocketsService.emitProjectUpdated(project.id, {
+      action: 'deleted',
+      project,
+    });
+
     return project;
   }
 
@@ -127,7 +150,7 @@ export class ProjectsService {
    */
   async addCollaborator(projectId: string, userId: string) {
     // Check if the project exists
-    await this.findById(projectId);
+    const project = await this.findById(projectId);
 
     // Check if the user exists
     const [user] = await this.db
@@ -163,6 +186,21 @@ export class ProjectsService {
       })
       .returning();
 
+    // Emit collaborator added event
+    this.websocketsService.emitCollaboratorAdded(projectId, {
+      project,
+      user,
+      collaboration,
+    });
+
+    // Emit notification to the user
+    this.websocketsService.emitNotification(userId, {
+      type: 'project_invitation',
+      message: `You have been added as a collaborator to the project "${project.name}"`,
+      projectId,
+      projectName: project.name,
+    });
+
     return collaboration;
   }