Permit GitHub App manifest form posts and signed HTTPS VNC preview iframes while keeping the rest of the SPA CSP locked down. Mirror the policy in the split-web Caddy config.
## Summary
Adds a standalone Docker Compose proof that runs the Fabro Rust API, a
Caddy static SPA server, and a Caddy edge proxy as separate services.
This demonstrates split web asset serving while keeping `/api/*`,
`/auth/*`, and `/health` same-origin with the API server.
## Changes
- Adds `docker-compose.split-web.yaml` with private `fabro-api` and
`fabro-web` services behind an exposed `edge` proxy on port 8080.
- Adds Caddy edge routing that sends `/api/*`, `/auth/*`, and `/health`
to Rust, while everything else goes to the static web service.
- Adds a static Caddy config for `apps/fabro-web/dist` with SPA
fallback, source-map blocking, security headers, immutable asset
caching, and `X-Fabro-PoC-Upstream` route-proof headers.
- Adds PoC server settings and a README with build, run, and validation
commands.
## Verification
- `cargo dev docker-build --tag fabro-sh/fabro:split-web-poc`
- `docker compose -f docker-compose.split-web.yaml up -d`
- `docker compose -f docker-compose.split-web.yaml ps`
- `curl` checks for `/runs`, `/assets/app.css`, `/assets/app.css.map`,
`/api/v1/health`, `/api/v1/auth/config`, `/auth/login/dev-token`,
`/api/v1/auth/me`, and `/api/v1/attach`
- Browser login flow via `browser-use`: loaded `/login`, submitted the
dev token, and landed on the authenticated Runs screen
- `docker compose -f docker-compose.split-web.yaml config`
- `caddy validate` for both Caddyfiles
- `git diff --check`
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