fix: cell-network name, install error surfacing, health history cleanup

- docker-compose.services.yml: change external network name from
  pic_cell-network to cell-network so store-service compose files can find
  it.  The project-prefixed name was overriding the explicit name: cell-network
  fix in docker-compose.yml when both files were merged by make start.

- service_store.py: normalize docker compose stderr into the error key in
  the 400 response so the Store page shows the actual failure reason instead
  of the generic fallback message.

- app.py: skip health checks for email/calendar/files managers when those
  optional store services are not installed — prevents false Down alerts and
  unnecessary noise in health history.

- Logs.jsx: remove Email/Calendar/Files columns from the health history table;
  they are optional store services, not core builtins that should always appear.

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

api/app.py

@@ -519,9 +519,18 @@ def perform_health_check():
             'timestamp': datetime.utcnow().isoformat(),
             'alerts': []
         }
-        
+
+        # email/calendar/files are optional store services — only check them when installed
+        _installed_store_ids = set(config_manager.get_installed_services())
+        _OPTIONAL_STORE_MANAGERS = frozenset({'email_manager', 'calendar_manager', 'file_manager'})
+
         # Get health from each service
         for service_name in service_bus.list_services():
+            if service_name in _OPTIONAL_STORE_MANAGERS:
+                # Map manager name to store service id (strip _manager suffix)
+                store_id = service_name.replace('_manager', '')
+                if store_id not in _installed_store_ids:
+                    continue
             try:
                 service = service_bus.get_service(service_name)
                 if hasattr(service, 'health_check'):
@@ -531,7 +540,7 @@ def perform_health_check():
                 result[service_name] = health
             except Exception as e:
                 result[service_name] = {'error': str(e), 'status': 'offline'}
-        
+
         # Health alerting logic — alert only when a service container is not running
         global service_alert_counters
         for service_name in service_bus.list_services():