Add a "Por Categoría" tab in the bot config UI where each permission
category (1, 2, 3) can be assigned its own greeting button menu.
When a user writes without an active context, the bot shows the menu
configured for their category instead of falling through to the global
greeting text.
NormalBot.process() now checks per_type[X].greeting_menu first, which
directly references a menu key and serves as both greeting and fallback
for that category. Fully backward-compatible with existing greeting_flow.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
