hbc/hbc_mini: add owner config; include in os_info; server applies to host

- owner: optional top-level config key in ~/.hbc.yaml / ~/.hbc.json
- Propagated into plugin configs at load time so os_info can include it
- os_info PLG data carries owner field when set
- udp: sets host.owner from os_info if not already configured server-side
- live.html: format event log timestamps as YYYY-MM-DD HH:MM:SS (24-hour)

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

hbd/client/plugin.py

@@ -364,7 +364,10 @@ class PluginLoader:
                     
                     # Instantiate plugin with config — check plugins subdict first,
                     # then top-level keys (e.g. nagios_runner: ... at root of config).
-                    plugin_instance_config = plugins_subconfig.get(obj.name) or raw_config.get(obj.name, {})
+                    plugin_instance_config = dict(plugins_subconfig.get(obj.name) or raw_config.get(obj.name) or {})
+                    # Propagate top-level owner so os_info (and any future plugin) can report it.
+                    if "owner" in raw_config and "owner" not in plugin_instance_config:
+                        plugin_instance_config["owner"] = raw_config["owner"]
                     plugin = obj(config=plugin_instance_config)
                     
                     # Initialize plugin