refactor: migrate to src package layout and wscraper entry module

pyproject.toml

@@ -0,0 +1,22 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "wscraper"
+version = "0.1.0"
+description = "Multi-site scraper CLI"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+  "scrapling[fetchers]==0.4.1",
+]
+
+[project.scripts]
+wscraper = "wscraper.cli:main"
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+
+[tool.setuptools.packages.find]
+where = ["src"]