feat(watcher,api,frontend): archive who writes to watched bots over mtproto

backend/Makefile

@@ -2,7 +2,7 @@ COMPOSE := cd .. && docker compose
 IMAGE := beavergram/backend
 IMAGE_INPUTS := pyproject.toml uv.lock Dockerfile
 CODE := src scripts ../frontend
-SERVICES := api userbot
+SERVICES := api userbot watcher
 changed = ! git diff --quiet $(1) -- $(2) 2>/dev/null
 stamp = { git update-ref $(1) HEAD 2>/dev/null || true; }