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/domain/src/lib/read-models/insights.read-model.ts

@@ -1,3 +1,4 @@
+import { EpicReadModel } from './issue.read-model';
 import { UserRefReadModel } from './user-ref.read-model';
 
 /** A ticket named by the dashboard, with the number that put it there. */
@@ -189,3 +190,23 @@ export class ProjectInsightsReadModel {
   /** One per active list (SELECT) custom field. */
   fields!: FieldBreakdownReadModel[];
 }
+
+/** One of my projects at a glance, for the portfolio. */
+export class PortfolioProjectReadModel {
+  projectId!: string;
+  key!: string;
+  name!: string;
+  isPublic!: boolean;
+  total!: number;
+  open!: number;
+  overdue!: number;
+  blocked!: number;
+  stuck!: number;
+  /** The sprint under way, if any. */
+  sprint!: SprintPulseReadModel | null;
+  /** Planned releases with their forecast. */
+  releases!: ReleaseForecastReadModel[];
+  /** Open epics (nearest due date first), at most six. */
+  epics!: EpicReadModel[];
+  updatedAt!: string;
+}