Migrate to pyproject.toml (PEP 621), remove setup.py and setup.cfg (#122)

Consolidate all build configuration into pyproject.toml, replacing the
legacy setup.py/setup.cfg approach. Tested on Python 3.9, 3.12, and 3.13.

Co-authored-by: Adam Dobrawy <naczelnik@jawne.info.pl>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people

pyproject.toml

@@ -1,7 +1,38 @@
+[build-system]
+requires = ["setuptools>=64", "setuptools-scm>=8"]
+build-backend = "setuptools.build_meta"
+
 [project]
 name = "python-anticaptcha"
+description = "Client library for solve captchas with Anticaptcha.com support."
+readme = "README.rst"
+license = "MIT"
 requires-python = ">=3.9"
-dynamic = ["version", "description", "readme", "dependencies", "optional-dependencies"]
+dependencies = ["requests"]
+dynamic = ["version"]
+keywords = ["recaptcha", "captcha", "development"]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
+]
+
+[project.urls]
+Homepage = "https://github.com/ad-m/python-anticaptcha"
+
+[project.optional-dependencies]
+async = ["httpx>=0.24"]
+tests = ["pytest", "retry", "selenium"]
+docs = ["sphinx"]
+
+[tool.setuptools-scm]
+fallback_version = "0.0.0"
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]