chore: add consistent mise.toml, justfile, and tooling config

pyproject.toml

@@ -14,6 +14,9 @@ dependencies = [
 [project.scripts]
 donglora-mux = "donglora_mux:main"
 
+[dependency-groups]
+dev = ["ruff"]
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"