fix: allow portal doc-event trigger lookup

[esafwan]

Summary

• Allow HUF doc-event trigger lookup to read Agent Trigger rows without using the current portal user's permissions.
• Prevent Supplier portal actions, such as RFQ quote submission and Purchase Invoice creation/review, from failing with Insufficient Permission for Agent Trigger.

Root Cause

HUF registers doc-event hooks globally. When a website Supplier user created or updated a procurement document through the ERPNext portal, the hook attempted to read Agent Trigger with that Supplier user's permissions. Supplier users should not have access to AI trigger configuration, so the document action failed before the portal workflow could complete.

Validation

• Ran python3 -m py_compile huf/ai/agent_hooks.py.
• Migrated and restarted property.localhost bench.
• Verified vendor RFQ quote submission in browser created a Supplier Quotation without the Agent Trigger permission error.
• Verified vendor Purchase Invoice portal page loads without permission errors.