version 5.1.8

- fix: matrix/sms_voipms notifications blocked the event loop on timeout;
  make send_notification async, dispatch all channel drivers as non-blocking
  tasks (asyncio.to_thread for sync drivers, asyncio.wait_for for async);
  update all call sites to fire-and-forget via create_task
- feat: add /about page with version, runtime, uptime counter, and repo link
- fix: hbc_mini plugin data format now matches full hbc client so Host
  Overview displays memory, disk, and network metrics correctly

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

hbd/server/threshold.py

@@ -987,18 +987,14 @@ class ThresholdChecker:
         value: Any,
     ):
         """Send notification and log to journal/eventlog."""
-        try:
-            notify_mod.send_notification(
-                host_name,
-                notify_mod.Notification(
-                    title=f"[{lvl}] {host_name}",
-                    body=message,
-                    level=lvl,
-                ),
-            )
-            logger.info("Notification sent: %s", message)
-        except Exception as e:
-            logger.error("Failed to send notification: %s", e)
+        asyncio.get_event_loop().create_task(notify_mod.send_notification(
+            host_name,
+            notify_mod.Notification(
+                title=f"[{lvl}] {host_name}",
+                body=message,
+                level=lvl,
+            ),
+        ))
         
         # Log to journal
         if self.journal is not None:
@@ -1195,20 +1191,17 @@ class ThresholdChecker:
             else:
                 message = f"REMINDER ({alert_state.level.name}): {host_name} - {metric_path} = {value} (ongoing for {int(now - alert_state.since)}s)"
             
-            try:
-                notify_mod.send_notification(
-                    host_name,
-                    notify_mod.Notification(
-                        title=f"[REMINDER/{alert_state.level.name}] {host_name}",
-                        body=message,
-                        level=alert_state.level.name,
-                    ),
-                )
-                alert_state.last_notification = now
-                alert_state.notification_count += 1
-                logger.info("Re-notification sent: %s", message)
-            except Exception as e:
-                logger.error("Failed to send re-notification: %s", e)
+            asyncio.get_event_loop().create_task(notify_mod.send_notification(
+                host_name,
+                notify_mod.Notification(
+                    title=f"[REMINDER/{alert_state.level.name}] {host_name}",
+                    body=message,
+                    level=alert_state.level.name,
+                ),
+            ))
+            alert_state.last_notification = now
+            alert_state.notification_count += 1
+            logger.info("Re-notification sent: %s", message)
     
     def get_active_alerts(self, alert_states: Dict[str, AlertState]) -> list:
         """