env.get() isn't an Odoo Environment method, so the existence guard
silently returned without ever writing the bot's presence row. Use the
'in self.env' check instead.
Extend cron_ping_all to upsert a bus.presence row for the
activeblue_ai_bot user, mirroring the agent service's reachability:
green dot when /health responds 200, offline otherwise. Drop the cron
interval from 5m to 1m so the presence stays fresh (Odoo's presence
client expects refreshes well under a minute).