First forecast test version

[killer0071234]

No description provided.

[Copilot]

Pull request overview

This PR introduces an initial implementation of forecast retrieval/parsing for GeoSphere Austria data in ZamgData, along with tests and related developer-environment/tooling updates.

Changes:

• Add forecast endpoints plus helpers to extract “current” forecast values and trim forecast payloads to “now onward”.
• Add initial forecast tests and adjust existing async-failure testing to work with aresponses v3.
• Update dev tooling/config (Poetry dependency groups, pre-commit hooks, devcontainer/Dockerfile, VS Code launch config).

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
src/zamg/zamg.py	Adds forecast URLs, forecast caching, parsing helpers, and forecast parameter/metadata handling.
tests/test_zamg.py	Adds forecast-related tests and adjusts a connection-failure test to avoid old aresponses behavior.
src/zamg/__init__.py	Import formatting cleanup for exception exports.
requirements.txt	Bumps aresponses to 3.0.0.
requirements_test.txt	Bumps aresponses to 3.0.0.
pyproject.toml	Moves dev dependencies to Poetry’s dependency group format.
forecast_test.py	Adds a new example script to manually exercise forecast calls (currently named like a pytest test module).
examples/read_data.py	Minor formatting (blank line).
Dockerfile.dev	Simplifies apt setup and consolidates pip installs with constraints.
control.py	Minor formatting (blank line).
.vscode/launch.json	Switches debugger type to debugpy and adds a launch config for forecast_test.py.
.pre-commit-config.yaml	Adds isort, removes reorder-python-imports, and tweaks bandit deps.
.flake8	Adds E203 ignore (Black compatibility).
.devcontainer/devcontainer.json	Removes Intellicode extension from the devcontainer extensions list.

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