feat(notifications): add bump mode + russify Telegram live-tracker

ORCH-042: new ORCH_TRACKER_MODE (Settings.tracker_mode, default edit) selects
the live-tracker card behaviour. bump mode re-creates the card at the bottom of
the chat on every update (delete_telegram + send silently + repoint message_id),
keeping the "one card per task" invariant: <=1 new message per call, repoint
only on successful send, delete result never gates the send. New never-raising
delete_telegram helper. Anything != "bump" resolves to edit (zero regression).

Also russify/cosmetic-fix the card text (both modes): "Подтверждение BRD" label,
✅ after approve-gate, Russian stage labels, "📦 Внедрено". Docs updated in the
same PR (CHANGELOG, internals.md, .env.example).

Refs: ORCH-042

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.env.example

@@ -12,3 +12,8 @@ ORCH_GITEA_WEBHOOK_SECRET=
 ORCH_CLAUDE_BIN=/usr/bin/claude
 ORCH_REPOS_DIR=/home/slin/repos
 ORCH_DB_PATH=/app/data/orchestrator.db
+# ORCH-042: live-tracker mode. edit (DEFAULT) -> the task card is edited in place
+# (editMessageText). bump -> on every update the old card is deleted and a fresh
+# one is sent silently to the BOTTOM of the chat (deleteMessage + sendMessage +
+# repoint). One card per task in both modes. Any value other than "bump" -> edit.
+ORCH_TRACKER_MODE=edit