chore: inject HF metadata for widgets-api/linkedin-generator

♻️ (linkedin-generator): Extract gateway logic into gateway_wrapper

📌Update linkedin-generator widget to use python 3.12 and add inference-gateway-api-client

👷 Refactor deploy workflow into named steps

♻️ Refactor to used internal package inference_gateway_api_client

♻️ (linkedin-generator): Simplify widget API, use inference gateway client

✨ (linkedin-generator): Add Gradio Server widget for LinkedIn post generation