Eric Traut 51bfb5f3b1 Restore app-server websocket listener with auth guard (#22404)
## Why
PR #21843 removed the TCP websocket app-server listener, but that also
removed functionality that still needs to exist. Restoring it as-is
would reopen the old remote exposure problem, so this keeps the restored
listener while making remote and non-loopback usage require explicit
auth.

## What Changed
- Mostly reverts #21843 and reapplies the small merge-conflict
resolutions needed on top of current main.
- Restores ws://IP:PORT parsing, the app-server TCP websocket acceptor,
websocket auth CLI flags, and the associated tests.
- The only intentional behavior change from the restored code is that
non-loopback websocket listeners now fail startup unless --ws-auth
capability-token or --ws-auth signed-bearer-token is configured.
Loopback listeners remain available for local and SSH-forwarding
workflows.

## Reviewer Focus
Please focus review on the small auth-enforcement delta layered on top
of the revert:

- codex-rs/app-server-transport/src/transport/websocket.rs:
start_websocket_acceptor now rejects unauthenticated non-loopback
websocket binds before accepting connections.
- codex-rs/app-server-transport/src/transport/auth.rs: helper logic
classifies unauthenticated non-loopback listeners.
- codex-rs/app-server/tests/suite/v2/connection_handling_websocket.rs:
tests cover unauthenticated ws://0.0.0.0 startup rejection and
authenticated non-loopback capability-token startup.

Everything else is intended to be revert/merge-conflict restoration
rather than new product behavior.

## Verification

- Manually verified that TUI remoting is restored and that auth is
enforced for non-localhost urls.
2026-05-12 18:40:53 -07:00
2026-05-12 16:24:54 +02:00
2026-04-24 17:49:29 -07:00
2026-04-24 17:49:29 -07:00
2026-04-07 10:55:58 -07:00

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