fix: route guard and landing page links for institutional login portal

feat: introduce dedicated Senti Institutional Login Portal with technical styling and dynamic role propagation

feat: support registration and PIN reset in mobile app, optimize chat layout and fix mobile sidebar collapsing

Fix backend crashes, unify auth registration, remove mock profile data, and sync personal vs business settings

feat: add signup page and verify PIN on login securely with bcrypt

Deploy Senti AI to Hugging Face Spaces