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## 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.