feat: implement core functionality for camera preview application

- Add FrameDispatcher for distributing QVideoFrames to subscribers
- Implement TelemetryCollector to measure video pipeline performance metrics
- Create MainWindow as the main application interface with video rendering
- Develop AppMenuBar for camera selection, resolution, and FPS settings
- Establish overlay system for displaying telemetry metrics
- Set up project structure and configuration files
- Add unit tests for FrameDispatcher and TelemetryCollector

pyproject.toml

@@ -0,0 +1,43 @@
+[project]
+name = "duck-preview"
+version = "0.1.0"
+description = "Realtime camera preview application with telemetry"
+requires-python = ">=3.12"
+dependencies = [
+    "PySide6>=6.7",
+    "psutil>=6.0",
+]
+
+[project.scripts]
+duck-preview = "app.main:main"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+python_functions = ["test_*"]
+addopts = "-v"
+
+[tool.ruff]
+target-version = "py312"
+line-length = 100
+
+[tool.ruff.lint]
+select = [
+    "E",   # pycodestyle errors
+    "W",   # pycodestyle warnings
+    "F",   # pyflakes
+    "I",   # isort
+    "UP",  # pyupgrade
+    "B",   # flake8-bugbear
+    "N",   # pep8-naming
+]
+ignore = [
+    "B008",  # do not perform function calls in default arguments
+]
+
+[tool.ruff.lint.isort]
+known-first-party = ["app"]
+
+[tool.ruff.format]
+quote-style = "double"
+indent-style = "space"