Salvage of PR #41284 onto current main. Relocates the last 9 inline messaging
adapters (+ satellites: telegram_network, feishu_comment/_rules/meeting_invite,
wecom_crypto, wecom_callback) from gateway/platforms/ into self-contained
bundled plugins under plugins/platforms/<x>/, discovered via the platform
registry. Strips the per-platform core touchpoints from gateway/run.py,
gateway/config.py, hermes_cli/gateway.py, hermes_cli/setup.py, and
tools/send_message_tool.py.
Carries forward the migration fixes (explicit enabled:false honored,
get_connected_platforms forces discovery, plugin is_connected via
gateway.get_env_value, logs --component gateway matches plugins.platforms.*,
matrix hidden on Windows).
Additionally ports config keys main added since the PR base: the matrix
plugin's _apply_yaml_config now also covers allowed_users,
ignore_user_patterns, process_notices, and session_scope (the inline
gateway/config.py matrix block gained these in the 1340 commits the PR sat
open; they would otherwise have been silently dropped on deletion).
Register Telegram bot commands across default, private, and group scopes so
the slash-command menu is available outside DMs.
Changes from review feedback:
- Add asyncio.Lock to prevent race condition in _ensure_forum_commands
- Extract MAX_COMMANDS_PER_SCOPE constant (30) to avoid magic number
- Upgrade error logging from debug->warning in forum registration
- Add tests covering lazy forum registration and concurrent safety
- Remove /start handler from this PR (separate feature)
Fixes review: needs_work (race, magic number, log levels, missing tests)
