[Infra] Setup Vitest + piramide de testes (0 testes)

[rafaumeu]

Problema

Repo tem 0 testes. CI tem Quality Gate mas sem testes.

Objetivo

Piramide igual ao pianolouvorja/site:

Unit (Vitest + Vue Test Utils + Vuetify)

• vitest.config.ts, happy-dom
• Mock Vuetify global
• Coverage gradual: comecar 40%

E2E (Playwright)

• Smoke: app abre, navega modulos
• Liturgia, player

Mutation (Stryker)

• Services primeiro

CI

• Job testes + coverage
• Job E2E
• Job mutation (PR-only)

Criterios de aceite

• Vitest configurado
• 10+ testes unit
• CI com gate de testes
• Playwright smoke