Add runtime state, auto-mute schedules, and backup retries

config.example.yaml

@@ -8,6 +8,7 @@ telegram:
 paths:
   # JSON state file for artifacts
   artifact_state: "/opt/tg-bot/state.json"
+  runtime_state: "/var/server-bot/runtime.json"
   # Optional env file with RESTIC_* variables
   restic_env: "/etc/restic/restic.env"
 
@@ -24,6 +25,11 @@ alerts:
   notify_cooldown_sec: 900
   # If true, only critical load alerts are sent (no warn/OK)
   load_only_critical: false
+  # Optional auto-mute windows per category
+  auto_mute:
+    - category: "load"
+      start: "23:00"
+      end: "08:00"
   quiet_hours:
     enabled: false
     start: "23:00"