AI implementation for openai and claude.

CLAUDE.md

@@ -6,11 +6,11 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 DevDen is a self-hosted AI chat platform that enables organizations to provide AI-powered Q&A based on their own knowledge bases. Users interact through a clean chat interface while administrators manage knowledge bases, AI providers, and user access through a terminal-style dashboard.
 
-**Current Status:** Early prototype stage with static frontend (HTML/CSS/JS). Backend infrastructure is not yet implemented.
+**Current Status:** MVP with AI integration complete. Backend FastAPI server with Claude and OpenAI support. Frontend streams responses in real-time.
 
 ## Architecture
 
-**Planned Technology Stack:**
+**Technology Stack:**
 - **Frontend:** Vanilla JavaScript (prototype), potential migration to Svelte
 - **Backend:** FastAPI (Python)
 - **Database:** PostgreSQL (users, conversations, settings)
@@ -25,9 +25,24 @@ DevDen is a self-hosted AI chat platform that enables organizations to provide A
 
 ## Current Files
 
-- `index.html` - Main chat interface structure
-- `script.js` - Chat interaction logic (mock responses currently)
-- `style.css` - UI styling with fox-themed color scheme (accent: `#d4a574`)
+**Frontend:**
+- `index.html` - Main chat interface structure with welcome screen
+- `script.js` - Chat interaction logic with SSE streaming
+- `style.css` - Catppuccin Mocha theme with pixel aesthetic
+
+**Backend:**
+- `backend/app/main.py` - FastAPI application entry point
+- `backend/app/config.py` - Environment configuration
+- `backend/app/api/chat.py` - Chat endpoints (POST /api/chat, POST /api/chat/stream)
+- `backend/app/services/provider_manager.py` - Provider abstraction and fallback
+- `backend/app/services/provider_claude.py` - Claude implementation
+- `backend/app/services/provider_openai.py` - OpenAI implementation
+- `backend/app/models/schemas.py` - Pydantic request/response models
+
+**Infrastructure:**
+- `docker-compose.yml` - Multi-service orchestration
+- `backend/Dockerfile.backend` - Backend container
+- `.env.example` - Environment template
 
 ## Development Phases (from project.md)
 
@@ -39,14 +54,36 @@ DevDen is a self-hosted AI chat platform that enables organizations to provide A
 6. Git Integration - Auto-sync from repositories
 7. Polish - Production readiness
 
-## Commands (Future)
+## Commands
 
-When Docker infrastructure is implemented:
+**Start the application:**
 ```bash
-docker-compose up -d
-docker-compose exec devden-web python manage.py init-db
-docker-compose exec devden-web python manage.py create-admin --email admin@company.com
-docker-compose logs -f devden-web
+docker compose up -d --build
+```
+
+**View logs:**
+```bash
+docker compose logs -f backend
+docker compose logs -f frontend
+```
+
+**Stop the application:**
+```bash
+docker compose down
+```
+
+**Test backend API:**
+```bash
+# Health check
+curl http://localhost:8000/health
+
+# List available providers
+curl http://localhost:8000/api/chat/providers
+
+# Test chat (non-streaming)
+curl -X POST http://localhost:8000/api/chat \
+  -H "Content-Type: application/json" \
+  -d '{"message": "Hello!"}'
 ```
 
 ## Design Decisions