cleanup: revert debug supabase import exception to ImportError

debug: show real Supabase import error on HF Spaces

refactor: centralize LLM config and env-backed client setup

feat: login system, admin settings in Supabase, auth simplification

Feb sprint: vertical×function matrix, structured outliers, unified prompts

MCP bearer auth, HYBRID liveboards, universal context prompts

Merge feature/naming-convention-fix into feature/chat-interface

Features: Add tag support, improve error handling, MCP improvements

Fix chat interface: Enter key, DDL display, and pre-filled responses

fix: Implement consistent naming convention across all objects

feat: Add settings system and multi-LLM support