fix(nix): use pkgsStatic for musl deps

[definfo]

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[definfo]

filter and proxy are merged into a single closure classify (unified control layer over RouteAction).

[Copilot]

Pull request overview

This PR removes the PyPI index crawler used for pytorch-wheels, replaces it with simpler request classification logic, and updates E2E tests to run against local fake upstream/S3 services and a local Nix cache fixture. It also adjusts the AWS S3 client configuration to use request checksums when required.

Changes:

• Remove pypi_index module + scraper dependency, and simplify pytorch-wheels routing to a RouteAction-based classifier.
• Expand E2E coverage with local fake upstream/S3 services and a nix-serve-backed fixture for nix-channels/store.
• Drop large HTML fixtures previously used by the PyPI index crawler tests.

Reviewed changes

Copilot reviewed 14 out of 16 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/repos.rs	Replaces filter/proxy booleans with RouteAction classification; updates pytorch-wheels logic and tests.
src/storage.rs	Configures AWS S3 client to calculate request checksums when required.
src/pypi_index.rs	Removes PyPI index crawler and related logic/tests.
src/main.rs	Removes pypi_index module import.
src/common.rs	Removes PypiIndexConfig from config model and updates config test expectations.
Cargo.toml	Drops scraper dependency.
Cargo.lock	Removes transitive dependencies from scraper.
Rocket.toml	Removes [default.pypi_index] config section.
tests/config/Rocket.toml	Removes [default.pypi_index] config section used by tests.
tests/e2e/default.nix	Adds nix/s3/upstream local endpoints and wires in a Nix store fixture + fake services.
tests/e2e/simple.sh	Hardens E2E script and adds checks for pytorch-wheels caching and nix store mirroring.
tests/e2e/fake_services.py	Adds local fake upstream and fake S3 HTTP services for E2E.
tests/pytorch_wheels/whl.html	Removed (no longer needed after deleting PyPI index crawler).
tests/pytorch_wheels/whl_cu130.html	Removed (no longer needed after deleting PyPI index crawler).
tests/pytorch_wheels/whl_cu130_torch.html	Removed (no longer needed after deleting PyPI index crawler).

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