Move misplaced integration/e2e tests out of tests/unit/

[timenick]

Summary

Several test classes in tests/unit/ are actually integration or e2e tests — they download models from HuggingFace, require specific hardware (NPU/GPU), or run full pipelines. These should be moved to tests/integration/ or tests/e2e/ so that pytest tests/unit/ runs fast and offline.

Tests to move

A. To tests/integration/ (require network / model downloads)

Source file	Classes	Downloads
tests/unit/loader/test_load_hf_model.py	4 @pytest.mark.slow classes	resnet-18, clip, bert-tiny
tests/unit/config/test_build.py	3 @pytest.mark.slow classes	bert-tiny, resnet-18
tests/unit/loader/test_detect_task_and_class.py	2 @pytest.mark.slow classes	blip, resnet-18, convnext
tests/unit/loader/test_hf_model_class_mapping.py	TestHFModelClassMappingE2E	clip, bert-tiny
tests/unit/datasets/test_object_detection.py	Entire file	detr-resnet-50, mini-imagenet
tests/unit/optim/pipes/test_pipe_fusion.py	@pytest.mark.slow method	model architecture configs

B. To tests/e2e/ (require specific hardware)

Source file	Classes	Dependency
tests/unit/session/test_winml_session.py	TestWinMLSessionEPSpecific + test_winml_registry_ep_discovery	QNN/CUDA/DML/etc. EPs
tests/unit/session/test_ep_monitor.py	TestHWMonitorIntegration	Real NPU hardware

C. Naming / structure fixes

Action	Reason
tests/unit/optim/integration/test_optimizer.py → tests/unit/optim/test_optimizer.py	Content is unit tests; integration/ subdir shouldn't exist under unit/
tests/unit/models/auto/test_integration.py → test_automodel.py	File is 100% mocked, name is misleading
tests/integration/test_module_build_e2e.py → test_module_build.py	Already in integration dir, _e2e suffix redundant
tests/integration/test_quantization_e2e.py → test_quantization.py	Same

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