feat: portfolio of all my projects

/cartera (and GraphQL portfolio, REST /api/me/portfolio, MCP
get_portfolio) shows every active project I belong to (not archived, not
as a guest) at a glance: open, overdue, blocked and stuck tickets, the
sprint under way and whether it gets there, planned releases with their
forecast, and the open epics with their progress. It reuses the
dashboard's computations. A release with no tickets now reads «Sin
tickets» instead of «Todo hecho», here and on the dashboard.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/presenters/src/lib/http/dto/responses.dto.ts

@@ -1140,3 +1140,24 @@ export class ProjectInsightsDto {
   })
   fields!: FieldBreakdownDto[];
 }
+
+export class PortfolioProjectDto {
+  @ApiProperty({ format: 'uuid' }) projectId!: string;
+  @ApiProperty({ example: 'WEB' }) key!: string;
+  @ApiProperty() name!: string;
+  @ApiProperty() isPublic!: boolean;
+  @ApiProperty() total!: number;
+  @ApiProperty() open!: number;
+  @ApiProperty() overdue!: number;
+  @ApiProperty() blocked!: number;
+  @ApiProperty() stuck!: number;
+  @ApiProperty({ type: SprintPulseDto, nullable: true })
+  sprint!: SprintPulseDto | null;
+  @ApiProperty({ type: [ReleaseForecastDto] }) releases!: ReleaseForecastDto[];
+  @ApiProperty({
+    type: [EpicDto],
+    description: 'Open epics, nearest due date first (six at most)',
+  })
+  epics!: EpicDto[];
+  @ApiProperty() updatedAt!: string;
+}