fix: Clean up Docker configuration and resolve build issues

- Fix Windows line endings (CRLF) in docker-build.sh script
- Remove deprecated 'version' field from docker-compose.dev.yml
- Standardize database URL paths across compose files
- Optimize Dockerfile.production with better pip upgrade handling
- Improve health check timings for better container startup
- Add comprehensive Docker usage documentation
- Ensure all Docker files use consistent formatting and best practices

All Docker builds now work correctly and containers start successfully.

docker-compose.dev.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   delphi-db:
     build: 
@@ -11,7 +9,7 @@ services:
     ports:
       - "${EXTERNAL_PORT:-6920}:8000"
     environment:
-      - DATABASE_URL=${DATABASE_URL:-sqlite:///data/delphi_database.db}
+      - DATABASE_URL=${DATABASE_URL:-sqlite:///app/data/delphi_database.db}
       - SECRET_KEY=${SECRET_KEY:-dev-secret-key-not-for-production}
       - DEBUG=${DEBUG:-True}
       - ACCESS_TOKEN_EXPIRE_MINUTES=${ACCESS_TOKEN_EXPIRE_MINUTES:-120}