Sibling tests were mutating litellm.proxy.proxy_server.master_key and
prisma_client with raw setattr. Values leaked across tests in the same
xdist worker, flipping the auth short-circuit in user_api_key_auth and
causing unrelated tests (e.g. test_ui_view_session_spend_logs_pagination)
to return 401 instead of 200.
Replace raw setattr with monkeypatch in the two offending files and add
an autouse conftest fixture that snapshots/restores the known-leaky
module globals for every proxy test.
- Introduced `afile_content_streaming` and `file_content_streaming` functions in `litellm/files/main.py` to handle asynchronous and synchronous file content streaming.
- Added `FileContentStreamingResponse` class in `litellm/files/streaming.py` to manage streaming responses with logging capabilities.
- Updated OpenAI API integration in `litellm/llms/openai/openai.py` to support new streaming methods.
- Enhanced file content retrieval in `litellm/proxy/openai_files_endpoints/files_endpoints.py` to route requests for streaming.
- Added unit tests for the new streaming functionality in `tests/test_litellm/llms/openai/test_openai_file_content_streaming.py` and `tests/test_litellm/proxy/openai_files_endpoint/test_files_endpoint.py`.
- Refactored type hints and imports for better clarity and organization across modified files.
- Add database and Redis setup to litellm_mapped_tests_proxy job in CircleCI
- Create shared test helpers in tests/test_litellm/proxy/conftest.py for proxy test setup
- Refactor health endpoint tests to use shared helpers from conftest
- Support automatic Redis cache configuration when REDIS_HOST is set
- Ensure minimal config is created when Redis/database is needed
