Fix deferred logger annotations on Python 3.14

[rnilva]

Summary

Fix the two blockers found by the new release validation:

• logger fields disappeared on Python 3.14 because annotation evaluation is now deferred;
• the wheel smoke test imported LoggerBase from the package root rather than its documented expedantic.logger namespace.

Root cause

LoggerBase._resolve_schema() walks each class in the MRO, but used typing.get_type_hints(cls). Despite the per-class loop, get_type_hints() merges inherited annotations. Under Python 3.14's deferred annotation semantics, resolving a subclass could therefore try to evaluate base-class names in the subclass module and discard the whole schema when that failed. The preceding "__annotations__" in cls.__dict__ check was also incompatible with lazy annotation storage.

Changes

• use inspect.get_annotations(cls, eval_str=True), which ignores inherited annotations and resolves each class in its own namespace;
• remove the eager __annotations__ dictionary check;
• guard generic-origin checks with inspect.isclass();
• correct the isolated wheel smoke import.

The full Python 3.10–3.14 matrix, optional dataframe suite, and distribution build will run on this PR.