Streamline account and command handlers

[pakrym-oai]

Why

Account login/logout and command exec handlers were doing local error sends in the middle of each handler. That made these request flows branch heavily even though most of the logic is validate, perform the operation, and return the response.

What Changed

• Converted ChatGPT/API-key login, login cancel, logout, rate-limit, and add-credit handlers in codex-rs/app-server/src/codex_message_processor.rs to compute Result values and send them once at the request boundary.
• Applied the same shape to command exec start/write/resize/terminate handlers.
• Kept side-effect notifications in the same places after successful request handling.

Verification

• cargo check -p codex-app-server
• cargo test -p codex-app-server --test all v2::account -- --test-threads=1
• cargo test -p codex-app-server --test all v2::command_exec -- --test-threads=1

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Replace undefined send_optional_result call

exec_one_off_command now calls self.send_optional_result(...), but this commit does not define that method on CodexMessageProcessor or import any trait that provides it. This makes codex_message_processor.rs fail to compile when type-checking this function, blocking the app-server build.

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