ci: add Gitea Actions workflow for automated testing

- Create .gitea/workflows/ci.yml with 4 sequential jobs
  - lint: Run ESLint on root configuration
  - test-backend: Run backend Vitest tests with SQLite
  - test-frontend: Run frontend Vitest tests
  - test-e2e: Run Playwright E2E tests (bloqueante)
- E2E job automates server startup + Playwright test execution
- Configure Gitea Secrets for IGDB, RAWG, TheGamesDB API keys
- Add artifact upload for Playwright reports on failure
- Update SECURITY.md with CI/CD Secrets setup instructions
- Update docs/API_KEYS.md with production Gitea workflow guide
- Add tests/gitea-workflow.spec.ts with 12 validation tests
- Workflow triggers on push/PR to main and develop branches

package.json

@@ -36,7 +36,8 @@
     "eslint-plugin-prettier": "^5.5.5",
     "prettier": "^3.8.1",
     "typescript": "^5.9.3",
-    "vitest": "^0.34.1"
+    "vitest": "^0.34.1",
+    "yaml": "^2.8.2"
   },
   "packageManager": "yarn@4.12.0+sha512.f45ab632439a67f8bc759bf32ead036a1f413287b9042726b7cc4818b7b49e14e9423ba49b18f9e06ea4941c1ad062385b1d8760a8d5091a1a31e5f6219afca8"
 }