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

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

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

refine evaluation and fix CSV download problem

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

prevent conversation N+1 query

prevent conversation N+1 query

tune performance

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 scripts for new prompts

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

fix: Implement atomic SQL operations to prevent race conditions

fix: Add branch metadata to list conversations endpoint

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

refactor: Simplify architecture by removing AgentRepository

feat: Switch to gpt-5-mini and add AI SDK streaming with metadata

change UI to useChat functions

feat: Complete SEL Chat Coach - Traditional Chinese social-emotional learning platform