docs(deployment): correct frontend Pages build config (#1324)
the CF Pages frontend build config described in environments.md was
stale. verified against the live project config on each recreate today:
- build command: `cd frontend && bun run build`
→ `cd frontend && bun install && bun run build`
(SKIP_DEPENDENCY_INSTALL=1 is set to skip CF's auto-install, so the
build command has to run `bun install` itself)
- build output: `frontend/build`
→ `frontend/.svelte-kit/cloudflare`
(matches `pages_build_output_dir` in `frontend/wrangler.toml`)
- env vars list: added `SKIP_DEPENDENCY_INSTALL=1` which was missing
- prod custom domain line: added `www.plyr.fm` alongside `plyr.fm`
same fixes applied to both prod and staging subsections.
Co-authored-by: Claude Opus 4 (1M context) <noreply@anthropic.com>
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