chore(docs): completar Fase 2 — requisitos y arquitectura

- Añade/actualiza `docs/requirements.md`, `docs/architecture.md`, `docs/api-integration.md`, `docs/data-model.md`
- Documenta criterios de aceptación y decisiones técnico-arquitectónicas
- Recomendación: añadir `docs/legal-considerations.md` (pendiente)

.gitea/workflows/ci.yaml

@@ -0,0 +1,69 @@
+# CI pipeline for Quasar (Gitea Actions)
+# Jobs: build_and_test (install, prisma generate, lint, unit tests)
+#       e2e (Playwright, runs on pushes to main)
+# Note: `prisma generate` is allowed to continue on error to avoid blocking CI when native engines can't be built.
+
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  DATABASE_URL: file:./backend/dev.db
+
+jobs:
+  build_and_test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'yarn'
+
+      - name: Install dependencies
+        run: yarn install --immutable
+
+      - name: Prisma: generate (may fail on some runners)
+        run: yarn workspace quasar-backend run prisma:generate
+        continue-on-error: true
+
+      - name: Lint (backend)
+        run: yarn workspace quasar-backend run lint
+
+      - name: Run backend unit tests
+        run: yarn workspace quasar-backend run test
+
+  e2e:
+    runs-on: ubuntu-latest
+    needs: [build_and_test]
+    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'yarn'
+
+      - name: Install dependencies
+        run: yarn install --immutable
+
+      - name: Install Playwright browsers
+        run: yarn test:install
+        continue-on-error: true
+
+      - name: Run Playwright E2E
+        run: yarn test:ci
+
+# Metadatos
+# Autor: Quasar (investigación automatizada)
+# Última actualización: 2026-02-08