Fix: use builtin dataclasses.fields instead of __annotations__

[purarue]

in python3.14, computing the __annotations__ is done lazily which
leads to an error. see
https://docs.python.org/3/whatsnew/3.14.html#implications-for-readers-of-annotations

[coderabbitai]

Walkthrough

The change refactors trakt/config.py to replace iteration over __annotations__ with the dataclass fields() function for deriving configuration keys in the all() and load() methods, while preserving existing behavior and public API signatures.

Changes

Cohort / File(s)	Summary
Refactoring of field iteration trakt/config.py	Replaced __annotations__ iteration with dataclass.fields() for key extraction in all() and load() methods. Changed key retrieval to use field.name. Added import of fields from dataclasses module.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A rabbit hops through fields of code so fine,
Where annotations danced in every line,
Now dataclass fields take center stage,
Same behavior, cleaner page!
The config thrives, refactored with delight. ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: replacing annotations with dataclasses.fields to fix a compatibility issue.
Description check	✅ Passed	The PR description clearly explains the motivation for the change—addressing Python 3.14's lazy evaluation of annotations—and directly relates to the changeset which replaces annotations usage with dataclasses.fields.

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✨ Finishing touches

• 📝 Generate docstrings

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[purarue]

Heres the output in a debugger in python3.13, to show they're the same order:

ipdb> [field.name for field in fields(self)]
['APPLICATION_ID', 'CLIENT_ID', 'CLIENT_SECRET', 'OAUTH_EXPIRES_AT', 'OAUTH_REFRESH', 'OAUTH_TOKEN']
ipdb> self.__annotations__.keys()
dict_keys(['APPLICATION_ID', 'CLIENT_ID', 'CLIENT_SECRET', 'OAUTH_EXPIRES_AT', 'OAUTH_REFRESH', 'OAUTH_TOKEN'])
ipdb> p list(self.__annotations__.keys()) == [field.name for
field in fields(self)]
True

This fixes #95