Refactor code structure for improved readability and maintainability

pyproject.toml

@@ -1,7 +1,67 @@
+[build-system]
+requires = ["setuptools>=80.0.0"]
+build-backend = "setuptools.build_meta"
+
 [project]
 name = "yt-shorts-downloader"
 version = "0.1.0"
-description = "Add your description here"
+description = "Typed library and CLI for downloading YouTube Shorts as MP4 via Netscape cookie sessions"
 readme = "README.md"
 requires-python = ">=3.12"
-dependencies = []
+dependencies = [
+	"yt-dlp>=2024.12.13",
+]
+
+[project.scripts]
+yt-shorts-downloader = "yt_shorts_downloader.cli:main"
+
+[dependency-groups]
+dev = [
+	"deptry>=0.24.0",
+	"mypy>=1.14.1",
+	"pytest>=8.3.4",
+	"pytest-cov>=6.0.0",
+	"ruff>=0.8.4",
+]
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+include-package-data = true
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.setuptools.package-data]
+yt_shorts_downloader = ["py.typed"]
+
+[tool.ruff]
+line-length = 100
+src = ["src", "tests"]
+target-version = "py312"
+
+[tool.ruff.format]
+quote-style = "double"
+indent-style = "space"
+
+[tool.ruff.lint]
+select = ["B", "E", "F", "I", "PL", "RUF", "SIM", "UP"]
+ignore = ["PLR0913", "PLR2004"]
+
+[tool.mypy]
+python_version = "3.12"
+strict = true
+warn_redundant_casts = true
+warn_unreachable = true
+warn_unused_ignores = true
+show_error_codes = true
+pretty = true
+explicit_package_bases = true
+files = ["src", "tests"]
+mypy_path = "$MYPY_CONFIG_FILE_DIR/src:$MYPY_CONFIG_FILE_DIR/stubs"
+
+[tool.deptry.package_module_name_map]
+"yt-dlp" = "yt_dlp"
+
+[tool.pytest.ini_options]
+addopts = ["-ra", "--strict-config", "--strict-markers", "--color=yes"]
+testpaths = ["tests"]