feat: support data.pypsa.org and its manifests

[coroa]

Add support for data.pypsa.org

This PR extends the cached-http storage plugin to support data.pypsa.org alongside the existing Zenodo support.

Changes

New Features:

• Support for data.pypsa.org URLs with manifest-based metadata
• Checksums are read from manifest.yaml files (searched up the directory tree)
• Redirect support for data.pypsa.org files that point to other locations

Tests:

• Refactored tests to use parametrized fixtures (["zenodo", "pypsa"])
• All tests now run against both backends
• Added test_is_valid_query_pypsa for URL validation

Documentation:

• Updated README.md with data.pypsa.org examples and supported sources
• Updated CLAUDE.md with architecture details for both backends

Example Usage

rule download_pypsa:
    input:
        storage("https://data.pypsa.org/workflows/eur/eez/v12_20231025/World_EEZ_v12_20231025_LR.zip"),
    output:
        "resources/eez.zip"
    shell:
        "cp {input} {output}"

[lkstrp]

As said above, worth to add?

[coroa]

I don't think it's important, but it would not hurt.

[lkstrp]

Ok, coming with the next sync (not too soon, might wanna add/ organize the metadata before that)

[lkstrp]

I haven't tested this but CI will 🤞