fix: recognise PEP 695 type aliases as Depends() parameters

[cezar-hapiko]

Problem

Since 1.5.0, _build_dependency_only_callable pre-filters parameters with _has_depends, which checks get_origin(param.annotation) is Annotated. For a PEP 695 alias:

type SettingsDep = Annotated[Settings, Depends(get_settings)]

@injectable
async def build_worker(settings: SettingsDep) -> Worker: ...

param.annotation is a TypeAliasType, get_origin returns None, the parameter is stripped before FastAPI sees it, and the call fails with:

TypeError: build_worker() missing 1 required positional argument: 'settings'

FastAPI's own resolver unwraps these aliases, so the same providers work in routes; only @injectable breaks. 1.4.6 passed the function straight to get_dependant and worked. This bit us on upgrade from 1.4.6 to 1.6.1: every @injectable worker factory in a codebase that uses type XDep = Annotated[...] aliases throughout failed at startup.

Fix

Unwrap TypeAliasType before inspecting the annotation. Both typing.TypeAliasType and typing_extensions.TypeAliasType are handled — they are distinct classes on 3.12 and 3.13, so checking only one misses the other.

Test

test_injectable_resolves_pep695_type_alias_dependency is parametrized over both alias classes (the typing case skips below 3.12). It fails on main with the TypeError above and passes with this change. Full suite: 231 passed on 3.10, 232 passed on 3.12; mypy src and ruff clean.

Also verified downstream: a ~3000-test application suite that failed at worker startup on 1.6.1 passes fully with this patch applied.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1bc48a1) to head (c10b89e).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #261   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          595       603    +8     
  Branches        72        73    +1     
=========================================
+ Hits           595       603    +8     

Files with missing lines	Coverage Δ
src/fastapi_injectable/main.py	100.00% <100.00%> (ø)

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