[Fix] ApiClient.send() return type should include None (#1097)

[rquidute]

Description

mypy th_cli/api_lib_autogen fails on freshly generated clients (via scripts/generate_client.sh):

th_cli/api_lib_autogen/api_client.py:117: error: Incompatible return value type (got "None", expected "T | str")  [return-value]

ApiClient.send() explicitly return None for 204 responses / type_=None, but is declared -> T | str, which doesn't include None.

Changes

• scripts/datamodel_generate_client.py: fix the send() return type annotation in the generator template (T | str → T | str | None).
• th_cli/api_lib_autogen/api_client.py: apply the same fix to the currently checked-in generated file, so it matches what regenerating against a live backend now produces.

Related

Fixes #1097 (project-chip/certification-tool), filed while validating #113 — confirmed pre-existing/identical on v2.16-cli-develop, unrelated to that PR's changes.

Testing

• python3 -m py_compile on both files.
• flake8 clean.
• Verified no other code in the checked-in codebase calls ApiClient.send() directly (only through request()/request_sync(), which are already Any-typed at the implementation level).
• Full poetry run mypy th_cli/api_lib_autogen / pytest were not run in the environment this was authored in (no network access to install the CLI's pydantic v2 dependencies) — please confirm on your machine before merging. This should resolve the exact error reported from a live-backend codegen run.

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