Refactor: Continuous conversation, UI improvements, and build fixes

Merge branch 'main' of https://huggingface.co/spaces/colearn30/colearn30-ai-grading-agents into main

fix: resolve syntax error in openai_service.py

Update backend/app/services/openai_service.py

Update backend/app/routers/grading.py

Update backend/app/models/grading.py

Update frontend/src/types/index.ts

Update frontend/src/App.tsx

feat: add continuous conversation, relax prompt constraints, and fix docker config

Update frontend/src/App.tsx

Update backend/app/models/grading.py

Update backend/app/routers/grading.py

Update frontend/src/types/index.ts

Update backend/app/services/openai_service.py

Update backend/app/services/openai_service.py

Update frontend/src/App.tsx

Update frontend/src/App.tsx

Update backend/agents.yaml

Update backend/agents.yaml

Update backend/agents.yaml

feat: Add grading progress modal with assistant info

chore: Remove root agents.yaml, keep only backend/agents.yaml

Revert "chore: Remove duplicate agents.yaml from root, keep only in backend/"

chore: Remove duplicate agents.yaml from root, keep only in backend/

fix: Add agents.yaml to backend directory for HF Spaces deployment

fix: Improve agents.yaml path detection with detailed logging

fix: Auto-detect agents.yaml path for different environments

feat: Refactor assistant system with auto-matching and manual selection

Add missing password protection files

Add password protection system

fix: Reorganize header layout and fix API docs link

feat: Add 批改心法課程 link to header navigation

feat: Add header navigation with Assistant guide and API docs

docs: Add comprehensive OpenAI Assistant setup guide

fix: Add explicit extra_headers for assistants v2 on all API calls

FORCE: HF Spaces rebuild with API v2 fix - build 0049

debug: Use manual version number for HF deployment tracking

debug: Add commit hash to API title for version tracking

debug: Add logging to verify API v2 header initialization

force: Trigger HF Spaces restart for API v2 deployment

fix: Add API v2 header to assistant_setup.py

force: Rebuild HF Spaces container to apply API v2 fix

trigger: Force HF Spaces rebuild for API v2 fix

fix: Update to OpenAI Assistants API v2

fix: Remove conflicting root route from backend main.py

fix: Correct frontend dist path in hf_app.py

fix: Create separate HF Spaces entry point to avoid import conflicts

fix: Use importlib to avoid module name conflicts in HF Spaces

fix: Resolve Python import paths for HF Spaces deployment

fix: Add HF Spaces deployment configuration