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/nodejs/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "docfast",
+  "version": "0.1.0",
+  "description": "Official Node.js client for the DocFast HTML-to-PDF API",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "files": ["dist"],
+  "engines": { "node": ">=18.0.0" },
+  "scripts": {
+    "build": "tsc",
+    "prepublishOnly": "npm run build"
+  },
+  "keywords": ["pdf", "html-to-pdf", "markdown-to-pdf", "docfast", "api", "document"],
+  "author": "DocFast <support@docfast.dev>",
+  "license": "MIT",
+  "homepage": "https://docfast.dev",
+  "repository": {
+    "type": "git",
+    "url": "https://git.cloonar.com/openclawd/docfast"
+  },
+  "devDependencies": {
+    "typescript": "^5.0.0"
+  }
+}