Revert "chore: reduce coach prompt trigger threshold from 10 to 5 messages"

chore: reduce coach prompt trigger threshold from 10 to 5 messages

feat: add early username availability check on registration step 1

feat: add "無任職" position option to registration form

validate username when registration

support additional teacher registration information

feat: defer coach selection to ad prompt with two-step UI

support reset evaluation prompt

support updating evaluation prompt in UI

refine evaluation and fix CSV download problem

support conversation evaluation

support admin login page

support admin login page

Change the coach conversation trigger from 15 messages to 10 messages

fix: resolve 404 error when branching from new messages

Change the coach conversation trigger from 6 messages to 15 messages

make conversation query more friendly

prevent conversation N+1 query

prevent conversation N+1 query

prevent conversation N+1 query

tune performance

fix: Prevent Supabase connection pool exhaustion in health endpoint

fix: Correct sessions table column mapping in health endpoint

fix: Improve Supabase connection handling and fix health endpoint schema errors

feat: Add production deployment support with Supabase and Docker

fix download conversation problem

fix admin conversation UI problem

Merge remote-tracking branch 'origin/main' into ui-update

feat: Change coach ad prompt threshold from 15 to 6 messages and hide UI elements

fix: Use database-backed PromptService in /api/personalities endpoint

fix scripts for new prompts

feat: Add database-backed prompt management system with repository pattern

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

fix: Implement atomic SQL operations to prevent race conditions

fix: Add branch metadata to list conversations endpoint

fix: Fix SQLite boolean bug and separate API tests from UI tests

refactor: Remove studentName/coachName from database, derive from templates

feat: Add system messages API and comprehensive API documentation

feat: Replace summary banner with student background system message

feat: Add response ID expiration handling for OpenAI Responses API

fix: Resolve infinite loop in conversation page during message streaming

refactor: Adopt OpenAI Responses API for conversation continuity and improve test reliability

feat: Add coach advertising prompt after 15 student messages

feat: Add comprehensive Basic Auth and enhance prompts with developmental theory

feat: Add graceful degradation for removed student templates

feat: Add quoted reply feature with enhanced speaker context

fix: Fix coach_direct conversation UI and messaging errors

feat: Add auto-generated conversation titles with inline editing

feat: Auto-navigate to latest conversation and fix logout flow

feat: Replace @coach prefix with dual toggle buttons for student/coach mode