Add selftest scheduler, queue history, and OpenWrt signal stats

config.example.yaml

@@ -30,6 +30,8 @@ alerts:
     - category: "load"
       start: "23:00"
       end: "08:00"
+  # Auto-mute load when critical load fires (seconds)
+  auto_mute_on_high_load_sec: 600
   quiet_hours:
     enabled: false
     start: "23:00"
@@ -78,6 +80,11 @@ reports:
     day: "Sun"      # Mon/Tue/Wed/Thu/Fri/Sat/Sun
     time: "08:00"   # HH:MM server local time
 
+selftest:
+  schedule:
+    enabled: false
+    time: "03:30"
+
 external_checks:
   enabled: true
   state_path: "/var/server-bot/external_checks.json"