feat(telegram): expose channel policies and bind native choices

[ideshun]

Behavior

Expose Telegram group activation, allowlists, topic isolation, reply/edited-message policy, streaming, reactions, delivery options and media settings in the channel drawer. Defaults preserve existing group activation; users can explicitly choose stricter modes.

Topic-isolated sessions include channel instance, chat and topic identity, with routing metadata retained for scheduled delivery. Single-choice ask_user_question prompts and paginated model menus use native callbacks bound to sender/chat/topic and recheck agent ownership, thread identity and model eligibility. Stopping a Telegram response also signals the active Harness stream.

Dependency and scope

Requires the Gateway companion PR below. No dependency version is invented before its release; channel save/probe rejects unsupported options on older Gateway builds instead of silently ignoring them. Gateway should merge/release first, then Octop can pin the released version before this is ready to merge.

Agent switching is explicitly unsupported. Multi-select/free-text questions retain text handling. This does not introduce Telegram security-approval buttons or grant group administrators Octop administrative authority.

Validation

Commit hooks: Ruff, mypy (564 files), 128 targeted backend tests, TypeScript/Vite/PWA production build passed. Targeted frontend tests: 21 passed. Tested against companion Gateway source.

Full Octop suite is not claimed green: the 4,500-test local run was stopped for runtime cost; a broader run also exposed a reproducible history subprocess timeout outside these changes. Live Telegram behavior has not been tested. Draft until dependency release, full CI and live verification.

Companion Gateway PR: TencentCloud/octop-gateway#34

[ideshun]

This update adds Telegram channel settings for group activation, user and chat allowlists, topic isolation, streaming responses, and media delivery. It also adds native buttons for model selection and single-choice questions.

Screenshots below show the updated Telegram channel configuration UI.