revise evaluation to be generic

support reset evaluation prompt

support updating evaluation prompt in UI

refine evaluation and fix CSV download problem

support evaluating coach direct prompt

support conversation evaluation

support admin login page

support admin login page

fix admin conversation UI problem

refactor: Update tests and admin UI to use new prompt system

fix scripts for new prompts

fix: Fix 'Invalid Date' display in admin conversation messages

fix: Prevent rendering '0' in admin conversation messages + add regression test

feat: Add admin dashboard with stats bug fix and performance improvements