feat: Add livelli_idrometrici task with unified adapter-level caching

🧹 Major cleanup: Remove obsolete code, modernize task-agnostic architecture

Updated the adapter and the agent workflow (node, state, registry etc.). Updated web app, currently supporting omirl scraping

Set up of the project structure: langgraph and tool based agent. Implemented first tool and task: omirl_snapshot_summary adapter can scrape data from sensorstable omirl. Next step: add tool to agentic framework and deploy to hugging face. Next step: scrape data based on sensor filter.