[misc] refactor: remove sys.path hacks; rely on installed package layout

[ji-huazhong]

• Drop manual sys.path.append to the repo root in tests, recipe demo, and scripts.

• Imports from transfer_queue now assume the package is installed (e.g. pip install -e .) or the interpreter path is set correctly.

• Clean up noqa: E402 on affected imports where applicable.

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[Copilot]

Pull request overview

Refactors tests, scripts, and recipe demos to stop mutating sys.path at runtime and instead rely on transfer_queue being importable via normal installed package layout (e.g., pip install -e .), aligning local usage with CI.

Changes:

• Removed sys.path.append(...) path hacks across unit tests, e2e tests, scripts, and recipes.
• Normalized imports to direct transfer_queue.* imports and removed now-unnecessary # noqa: E402 suppressions.
• Minor whitespace cleanup in a storage client factory module.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
transfer_queue/storage/clients/factory.py	Removes stray whitespace line to keep module header/import section clean.
tests/test_yuanrong_client_zero_copy.py	Drops repo-root sys.path injection; imports GeneralKVClientAdapter directly and keeps importorskip.
tests/test_simple_storage_unit.py	Removes sys.path setup and noqa on first-party imports.
tests/test_serial_utils_on_cpu.py	Removes sys.path setup and noqa on first-party imports.
tests/test_samplers.py	Removes sys.path setup and noqa on sampler imports.
tests/test_ray_p2p.py	Removes sys.path setup and noqa on first-party imports.
tests/test_metadata.py	Removes sys.path setup and noqa on metadata imports.
tests/test_kv_storage_manager.py	Removes sys.path setup and noqa on first-party imports.
tests/test_controller_data_partitions.py	Removes sys.path setup block to rely on installed package imports.
tests/test_controller.py	Removes sys.path setup and noqa on controller import.
tests/test_client.py	Removes sys.path setup and noqa on first-party imports.
tests/test_async_simple_storage_manager.py	Removes sys.path setup and noqa on first-party imports.
tests/e2e/test_kv_interface_e2e.py	Removes sys.path setup and imports transfer_queue directly.
tests/e2e/test_e2e_lifecycle_consistency.py	Removes sys.path setup to rely on installed package layout.
scripts/put_benchmark.py	Removes sys.path setup and noqa on first-party imports.
scripts/performance_test/ray_perftest_baseline.py	Removes sys.path setup to rely on installed package layout.
scripts/performance_test/perftest.py	Removes sys.path setup and noqa on transfer_queue import.
recipe/simple_use_case/single_controller_demo.py	Removes sys.path setup to rely on installed package layout.

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