Drop the unused djet extra

[tomwojcik]

Removes djet from djoser entirely. The test suite relies on pytest alone.

Why

The pytest migration (#893) removed the last from djet import assertions. Since then djet has survived only as:

• an optional extra in published metadata (djoser[djet])
• an --extra djet install on all 28 CI matrix jobs

Two facts from full-history searches:

• djoser/ has never imported djet — git log --all -S'djet' -- djoser/ returns nothing
• it was never documented — git log --all -S'djet' -- docs/ README.rst returns nothing

So pip install djoser[djet] only ever installed a test helper that djoser does not call — a development dependency leaking into published metadata.

Compatibility

Requesting an extra that no longer exists is a warning, not an error. Verified against the released 2.3.4:

$ uv pip install --dry-run --no-deps 'djoser[nonexistent-extra]==2.3.4'
Resolved 1 package in 255ms
 + djoser==2.3.4

So existing djoser[djet] pins keep installing; they just stop pulling in djet.

Changes

• drop djet from [project.optional-dependencies]
• drop --extra djet from the three test-suite jobs
• uv lock — 101 → 100 packages, provides-extras = ["webauthn"]

Verified

• synced the exact CI environment (uv sync --group test --extra webauthn), confirmed djet is absent from it, and ran the suite there: 206 passed — the strongest evidence it is unused
• make run-hooks — all hooks pass
• make build — wheel METADATA now advertises only Provides-Extra: webauthn; the four runtime dependencies are unchanged
• uv lock --check — clean
• make docs — 6 warnings, the pre-existing baseline

🤖 Generated with Claude Code

https://claude.ai/code/session_01RUccbzSjBjZYvJtzbLjLo7

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.33%. Comparing base (5a5dc71) to head (3ea5418).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #919   +/-   ##
=======================================
  Coverage   99.33%   99.33%           
=======================================
  Files          27       27           
  Lines         908      908           
=======================================
  Hits          902      902           
  Misses          6        6           

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