Lower Python requirement to >=3.11 and add devcontainer

[Copilot]

Python 3.13 is too recent for production use. Lowered minimum to 3.11 and added devcontainer configuration for consistent development environments.

Changes

• Python version: >=3.13 → >=3.11 in pyproject.toml

  • Added classifiers for 3.11, 3.12, 3.13
  • Updated .python-version to 3.11

• DevContainer: New .devcontainer/devcontainer.json

  • Python 3.11 base image with UV package manager
  • VS Code extensions: Pylance, Ruff
  • Auto-sync dependencies on container creation
  • Forwards ENTSOE_API_KEY from host environment

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• astral.sh
  • Triggering command: /usr/bin/curl curl -LsSf REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

There is an issue with the library bc de requirement says Python 3.13 but that's very recent... is there a way to say minimum at 3.11 ? Also, could you configure a devcontainer.json ?

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