fix: Add missing langchain-classic dependency

The code uses langchain_classic but it wasn't in dependencies.
Added langchain-classic>=1.0.0 to pyproject.toml and reverted
generate_code_node.py to use langchain_classic (the correct import).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: 2 people

pyproject.toml

@@ -11,6 +11,7 @@ authors = [
 
 dependencies = [
     "langchain>=0.3.0",
+    "langchain-classic>=1.0.0",
     "langchain-openai>=0.1.22",
     "langchain-mistralai>=0.1.12",
     "langchain_community>=0.2.9",

scrapegraphai/nodes/generate_code_node.py

@@ -12,7 +12,7 @@
 from bs4 import BeautifulSoup
 from jsonschema import ValidationError as JSONSchemaValidationError
 from jsonschema import validate
-from langchain_community.output_parsers.structured import (
+from langchain_classic.output_parsers.structured import (
     ResponseSchema,
     StructuredOutputParser,
 )