Add structure_response helper to consolidate response deserialization

[iMicknl]

Summary

• Introduces structure_response helper in pyoverkiz/converter.py that combines decamelize + converter.structure into a single call
• Replaces all repeated converter.structure(decamelize(response), Type) patterns in client.py and tests with the new helper
• Uses PEP 695 type parameter syntax (def structure_response[T](...))

Test plan

• All 127 existing model tests pass
• Ruff linting passes

[Copilot]

Pull request overview

This PR consolidates Overkiz API response deserialization by introducing a single helper that decamelizes payloads and structures them via the shared cattrs converter, then updates client + model tests to use it.

Changes:

• Added structure_response helper in pyoverkiz/converter.py to combine decamelize() + converter.structure().
• Replaced repeated converter.structure(decamelize(response), T) call sites in pyoverkiz/client.py and tests/test_models.py with structure_response(response, T).
• Adopted PEP 695 type parameter syntax for the helper signature.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
pyoverkiz/converter.py	Adds structure_response to centralize response decamelization + structuring.
pyoverkiz/client.py	Refactors multiple endpoint methods to use structure_response for consistent deserialization.
tests/test_models.py	Updates model/event structuring tests to use structure_response instead of repeated decamelize+structure patterns.

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