feat: add official Node.js and Python SDKs

- Node.js SDK (sdk/nodejs/): TypeScript, zero deps, native fetch, Node 18+
- Python SDK (sdk/python/): sync + async clients via httpx, Python 3.8+
- Both wrap all conversion endpoints (html, markdown, url, templates)
- Proper error handling with DocFastError
- Full README documentation for each

sdk/python/pyproject.toml

@@ -0,0 +1,26 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "docfast"
+version = "0.1.0"
+description = "Official Python client for the DocFast HTML-to-PDF API"
+readme = "README.md"
+license = "MIT"
+requires-python = ">=3.8"
+authors = [{ name = "DocFast", email = "support@docfast.dev" }]
+keywords = ["pdf", "html-to-pdf", "markdown-to-pdf", "docfast", "api"]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3",
+    "Topic :: Software Development :: Libraries",
+]
+dependencies = ["httpx>=0.24.0"]
+
+[project.urls]
+Homepage = "https://docfast.dev"
+Documentation = "https://docfast.dev/docs"
+Repository = "https://git.cloonar.com/openclawd/docfast"