Two cleanups from the /simplify review pass:
* ``Response`` was imported inside the ``except OSError`` branch in
``/get_image`` and at the top of ``/get_favicon``. Per the project's
no-inline-imports rule (CLAUDE.md), hoisted to the existing
``from fastapi.responses import (...)`` block at the top of
``proxy_server.py``.
* The test class's ``_patches()`` helper returned a 2-element list of
patch context managers and tests indexed into them via
``self._patches(...)[0], self._patches()[1]`` — two distinct calls
with confusing aliasing semantics. Restructured to:
- module-level ``_patch_async_safe_get(...)`` that returns a single
patch context manager
- autouse fixture that patches ``get_async_httpx_client`` for every
test in the file (it's the same patch in every case)
- small ``_image_response(...)`` factory to deduplicate Mock setup
Tests now read as ``with _patch_async_safe_get(return_value=...):``
with no list-indexing or duplicate Mock construction.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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