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/config.py

@@ -15,12 +15,15 @@ CLIENT_DEFAULTS = {
     # Network settings
     "hb_port": 50003,          # Port where hbd servers listen
     "interval": 10,             # Heartbeat interval in seconds
-    
+
+    # Host identity
+    "owner": None,             # Optional username to set as this host's owner on the server
+
     # Runtime flags
     "foreground": False,
     "verbose": False,
     "debug": 0,
-    
+
     # Plugin configuration
     "plugins": {},              # Per-plugin configuration
     "thresholds": {},           # Threshold configuration for monitoring