build: replace hatchling with the uv_build backend and bump uv to 0.12

[vdusek]

Switches the build backend from hatchling to uv_build, replacing the [tool.hatch.build.targets.*] config with [tool.uv.build-backend]. Only CHANGELOG.md and CONTRIBUTING.md need an explicit source-include - the module, pyproject.toml, README, and LICENSE are in the sdist by default.

License metadata moves to PEP 639: license = "Apache-2.0" plus license-files = ["LICENSE"]. That part is required, not cosmetic: uv_build ships LICENSE inside the wheel only when it is declared via license-files, and uv rejects license-files combined with the legacy license = { file = ... } table.

The License :: OSI Approved :: Apache Software License classifier is dropped because PEP 639 deprecates license classifiers in favor of License-Expression, which now carries the same information ("Using license classifier in the Classifier Core Metadata field is deprecated and replaced by the more precise License-Expression field"). See also the core metadata spec. uv warns about the classifier on every build.

The project template's Dockerfile now pulls ghcr.io/astral-sh/uv:0.12.

Verified by building sdist + wheel before and after: the wheel contents are identical, including the cookiecutter project template, the Redis Lua scripts, and the py.typed markers. The sdist drops .gitignore and gains pyproject.toml.orig (uv 0.12 writes a TOML 1.0-compatible pyproject.toml into the sdist and keeps the original alongside it). uv.lock is unchanged.

One metadata difference worth noting: hatchling flattened the self-referential extras, so crawlee[all] was published as the full list of concrete requirements. uv_build keeps them as declared, e.g. crawlee[adaptive-crawler,...] ; extra == 'all'. Both resolve identically in pip and uv.

✍️ Drafted by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.48%. Comparing base (cd1e1f6) to head (05ce349).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2098      +/-   ##
==========================================
- Coverage   93.51%   93.48%   -0.04%     
==========================================
  Files         181      181              
  Lines       12572    12604      +32     
==========================================
+ Hits        11757    11783      +26     
- Misses        815      821       +6     

Flag	Coverage Δ
unit	93.48% <ø> (-0.04%)	⬇️

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