fix(ci): E2E DinD networking + registry token auth

- playwright.config.ts: make baseURL configurable via PLAYWRIGHT_BASE_URL env var
- ci.yml: set PLAYWRIGHT_BASE_URL=http://host.docker.internal:8080 in e2e job step

Note: gitea.token registry auth not applicable — this repo uses GitHub Actions
with ghcr.io and secrets.GITHUB_TOKEN (already correct).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -86,6 +86,8 @@ jobs:
 
       - name: Run E2E tests
         run: pnpm --filter @groombook/e2e test
+        env:
+          PLAYWRIGHT_BASE_URL: http://host.docker.internal:8080
 
       - name: Upload Playwright report
         if: failure()