make api key requried

[Vikrant-Khedkar]

Make api key mandatory from optional

---

Note

Require scrapegraphApiKey in Smithery config and align server config schema with camelCase via Pydantic aliases.

• Config (Smithery):
  • Add configSchema requiring scrapegraphApiKey (string) with description in smithery.yaml.
• Server (Pydantic schema):
  • Import AliasChoices and update ConfigSchema.scrapegraph_api_key to accept scrapegraphApiKey/scrapegraph_api_key via validation_alias and serialize as scrapegraphApiKey.

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