refactoring: ♻️ replace call with __call__ in asfunction

[remimd]

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[Copilot]

Pull Request Overview

This PR refactors the asfunction decorator to use the standard __call__ method instead of a custom call method, simplifying the API and improving consistency with Python conventions.

• Replaced custom AsFunctionCallable protocol with standard Callable type
• Updated all method calls from call to __call__
• Simplified type definitions and removed unnecessary protocol abstractions

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
injection/_core/asfunction.py	Removes custom protocol, updates type hints, and changes method calls to use __call__
tests/core/test_asfunction.py	Updates test classes to use __call__ instead of call method
documentation/integrations/unlisted-framework.md	Updates documentation examples to show __call__ usage

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