chore: bump version to 0.6.4

Day-0 DeepSeek-V4-Flash support (#168).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Your Name

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "rapid-mlx"
-version = "0.6.3"
+version = "0.6.4"
 description = "Rapid-MLX — AI inference for Apple Silicon. Drop-in OpenAI API, 2-4x faster than Ollama."
 readme = "README.md"
 license = {text = "Apache-2.0"}