Introduce `tg_watchdog_heartbeat_every` to emit periodic INFO heartbeats.
Add cumulative diagnostics counters and richer logging for watchdog probes,
restart reasons, and disconnect‑flap triggers. Update defaults and tests
accordingly.
Introduce an active watchdog that probes the Telegram client to detect
zombie sessions and restart them in‑process. Add configurable disconnect
flap detection with a sliding window to trigger restarts after repeated
disconnects. New environment variables and config entries are added, and
the Kurigram dependency is now version‑pinned.
The proxy configuration now uses a SOCKS5 scheme instead of MTProto. The default port is updated to 1080 and optional username/password fields are supported. Docker compose comments are updated accordingly.
BREAKING CHANGE: existing MTProto proxy settings (scheme "mtproto", port 443) are no longer supported and must be migrated to SOCKS5.
Introduce optional MTProto proxy configuration sourced from environment variables, expose related settings in `config.py`, document the variables in `dockercompose.yml`, and pass the proxy configuration to the Telegram client initialization.
vvzvlad