feat: scaffold tuimble TUI mumble client

Core modules: TUI app (textual), mumble protocol client,
audio pipeline (sounddevice + opus), push-to-talk with
kitty protocol / evdev / toggle backends. Config via TOML.

pyproject.toml

@@ -0,0 +1,40 @@
+[build-system]
+requires = ["setuptools>=68.0", "setuptools-scm"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "tuimble"
+version = "0.1.0"
+description = "TUI Mumble client with voice support"
+requires-python = ">=3.11"
+dependencies = [
+    "textual>=1.0.0",
+    "pymumble>=1.6",
+    "sounddevice>=0.5.0",
+    "tomli>=2.0.0;python_version<'3.11'",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.0",
+    "ruff>=0.8.0",
+]
+evdev = [
+    "evdev>=1.7.0",
+]
+
+[project.scripts]
+tuimble = "tuimble.__main__:main"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.ruff]
+line-length = 88
+target-version = "py311"
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]