All configuration is now done exclusively through mimi_secrets.h at build time. Removed NVS read/write logic, CLI config commands (wifi_set, set_tg_token, set_api_key, set_model, set_proxy, clear_proxy, set_search_key), and setter functions from all modules. CLI retains debug/maintenance commands only. Updated all documentation to reflect the change. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>