scaffold blog_portal vue 3 + pinia + cypress frontend

Mirrors youngstartup/frontend/startups_portal scaffolding:
Vite, Vue 3 (composition API + script setup), TypeScript strict,
Pinia, Vue Router 5, oxlint + eslint + oxfmt, and Cypress with
db:reset / db:seed tasks. Views and the auth store are stubs
filled in by the next branches; routes and the header chrome
are wired so the build passes.

frontend/blog_portal/cypress/support/commands.ts

@@ -0,0 +1,21 @@
+/// <reference types="cypress" />
+
+declare global {
+  // eslint-disable-next-line @typescript-eslint/no-namespace
+  namespace Cypress {
+    interface Chainable {
+      resetDb(): Chainable<null>;
+      seedDb(): Chainable<null>;
+    }
+  }
+}
+
+Cypress.Commands.add("resetDb", function () {
+  return cy.task<null>("db:reset");
+});
+
+Cypress.Commands.add("seedDb", function () {
+  return cy.task<null>("db:seed");
+});
+
+export {};