fix(frontend): prefix auth API requests with VITE_PUBLIC_APP_URL for cross-origin Workers hosting

CHANGELOG.md

@@ -15,6 +15,11 @@
 - **HLS segment duration 2s**: Default `HLS_SEGMENT_DURATION` changed from 6 to 2 and `HLS_WINDOW_SIZE` from 24 to 12 (2s × 12 = 24s live window), reducing end-to-end latency; the 2s GOP was already in place.
 - **Chat font sizing**: `.message-text` set to `0.95rem` (slightly smaller than the default, larger than the `0.83rem` system/flash text).
 - **R2 retention by run count + size**: Playout now keeps the newest `R2_KEEP_RUNS` run folders (default 2) and enforces an `R2_MAX_RETENTION_BYTES` cap (default 10 GiB), replacing the old 24h time-based `R2_SEGMENT_RETENTION_HOURS` cleanup. Cleanup runs after each new run plus an hourly backstop, and never deletes the live manifest. Adds `linearvoid_playout_r2_runs_retained` and `linearvoid_playout_r2_bytes_retained` gauges.
+- **Cloudflare Workers frontend hosting**: Replaced Cloudflare Pages with a Cloudflare Worker (`linearvoid-frontend`) that serves the static SPA via Workers Static Assets. Added `frontend/wrangler.toml` and renamed the deploy workflow to `.gitea/workflows/workers-deploy.yml` (builds the SPA and runs `npx wrangler deploy`). Architecture, setup/deployment, and ops documentation updated from Pages to Workers.
+
+### Fixed
+
+- **Login/register cross-origin API URLs**: `submitAuth` in `frontend/src/main.ts` now prefixes `/api/auth/login` and `/api/auth/register` with `VITE_PUBLIC_APP_URL` (falling back to same-origin), matching the other API calls so the Workers-served SPA reaches the app origin instead of a same-origin path.
 
 ### Tests