update server to support adk requirements

[Vikrant-Khedkar]

Add instructions to run the MCP with google ADK and update the server to comply with the requirements of the ADK.

Update the Readme to include example on how to use it with ADK

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Note

Adds local usage and Google ADK integration docs, and updates MCP tool parameter schemas with Annotated/Field for ADK compatibility.

• Docs:
  • Add comprehensive "Local Usage" guide: install, env setup, running via stdio, MCP Inspector, Claude/Cursor configs, troubleshooting.
  • Add detailed "Google ADK Integration": prerequisites, install, example agent code, configuration options, and usage examples.
• Server (src/scrapegraph_mcp/server.py):
  • Enhance tool parameter schemas with Annotated + Field metadata for better MCP/ADK compatibility:
    • smartscraper: output_schema accepts string | object with schema description.
    • agentic_scrapper: output_schema and steps accept flexible types (string | object and string | string[]) with descriptions.
  • Import Annotated to support new type annotations.

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