fix: Fix YAML syntax errors and validator prompt formatting

- Fix YAML files with unquoted strings containing quotes
- Export singleton instances in ai/__init__.py
- Fix validator scoring prompt to use replace() instead of format()
  to avoid conflicts with JSON curly braces

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -16,6 +16,7 @@ services:
       - .env
     volumes:
       - ./app:/app/app
+      - ./dashboard:/app/dashboard
       - ./templates:/app/templates
       - ./data:/app/data
       - uploaded_images:/app/uploads