[FEAT] Disable Specific Personas

[NeonCharlie-24]

Objective

Add support for explicitly disabling specific advisors so they do not respond to user prompts.

Initial Implementation Requirements

• Implement a backend mechanism to mark specific advisors as disabled for a given user or globally
• Implement a frontend component to allow users to toggle individual advisors on/off
• Ensure disabled advisors are excluded from the orchestrator's persona selection (get_top_personas) and do not generate responses

Other Considerations

• Consider whether this should be per-user preference (stored on the user document) or a global admin setting (in config YAML)
• Consider UX for the toggle — could live in the existing Advisor Config panel, or the Settings modal
• Note: if we decide to do this globally (in config) it won't make sense to have a toggle visible to the user

[NeonCharlie-24]

• ideally want ability to config personas at system level (global), group level, and user level availability
• could allow groups to be selected by domain name

Make a function to abstract the persona filtering. Look at system config, then user config - filtering for personas based on selection at each level.

For system level config, consider using a whitelist (included) by BrainForge advisor name. Static config.

Consider setting permissions (who see what persona) based on the URL.