fix: spurious health alerts, show rotated logs, clear history button

app.py:
- Alert logic now checks status.running (container up/down) instead of healthy
  (which requires connectivity tests) — services are only alerted when actually down
- Add POST /api/health/history/clear endpoint to reset history + alert counters

log_manager.py:
- get_all_log_file_infos: include rotated backup files (*.log.1, *.log.2 ...) in listing,
  marked with backup=true so UI can dim them and hide rotate button

api.js: add monitoringAPI.clearHealthHistory

Logs page:
- Health History: add Clear button with confirmation
- File panel: show full filename (including .log.1 backups), explain host path and naming,
  hide rotate button for backup files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/app.py

@@ -234,36 +234,26 @@ def perform_health_check():
             except Exception as e:
                 result[service_name] = {'error': str(e), 'status': 'offline'}
         
-        # Health alerting logic - improved to be more robust
+        # Health alerting logic — alert only when a service container is not running
         global service_alert_counters
         for service_name in service_bus.list_services():
             if service_name in result:
                 status = result[service_name]
                 healthy = True
-                
-                # Improved health determination logic
+
                 if isinstance(status, dict):
-                    # Check for explicit healthy field first
-                    if 'healthy' in status:
-                        healthy = status['healthy']
-                    # Check for running status
+                    # Prefer status.running (container actually up) over healthy (connectivity tests)
+                    inner = status.get('status', {})
+                    if isinstance(inner, dict):
+                        if 'running' in inner:
+                            healthy = inner['running']
+                        elif 'status' in inner:
+                            healthy = str(inner['status']).lower() in ('ok', 'healthy', 'online', 'active')
                     elif 'running' in status:
                         healthy = status['running']
-                    # Check for status field with various healthy values
-                    elif 'status' in status:
-                        status_value = status['status']
-                        if isinstance(status_value, str):
-                            healthy = status_value.lower() in ('ok', 'healthy', 'online', 'active')
-                        else:
-                            healthy = bool(status_value)
-                    # Check for error field
                     elif 'error' in status:
                         healthy = False
-                    # If no health indicators, assume healthy if service exists
-                    else:
-                        healthy = True
                 else:
-                    # If status is not a dict, assume it's a boolean
                     healthy = bool(status)
                 
                 # Only count as unhealthy if we're certain it's down
@@ -1985,6 +1975,14 @@ def get_health_history():
     """Get recent unified health check results."""
     return jsonify(list(health_history))
 
+@app.route('/api/health/history/clear', methods=['POST'])
+def clear_health_history():
+    """Clear health history and reset alert counters."""
+    global service_alert_counters
+    health_history.clear()
+    service_alert_counters = {}
+    return jsonify({'message': 'Health history cleared'})
+
 @app.route('/api/logs', methods=['GET'])
 def get_backend_logs():
     """Get backend log file contents (last N lines)."""