[zaneni6]

Summary

Most standalone test harnesses under src/test/ no longer link on main. This fixes the two causes that apply to all of them.

• Backend registry. automodel.cpp builds engines through the backend registry, so a harness that compiles it also has to compile model_backend.cpp and define register_builtin_backends, as create_new_model.md says. Only the MiniCPM-V and rai harnesses did. The other 20 now do. Each registers the families of the engine libraries it already links, taken from builtin_backends.cpp. For example, qwen3_npu registers qwen3, qwen3-it, qwen3-tk and deepseek-r1-0528. Qwen3.5-Omni builds its engine itself, so its harness registers nothing.
• Engine library path. Since the HRX split, the prebuilt engine libraries live in src/lib/xrt and src/lib/hrx, but add_npu_test still linked from src/lib. It now links from src/lib/xrt, since the harness CMake is XRT-only.

Also:

• Whisper's Makefile drops automodel.cpp. Whisper never used it, and its CMake build already did without it.
• The MiniCPM-V harness CMake gets the image sources, AVX-512 and ffmpeg setup that its Makefile already has, the same as the other vision harnesses.

Testing

Windows, MSVC, CMake path:

• Results:
  • MiniCPM-V, gemma_npu, gemma_text_npu, gpt_oss_npu, hunyuan_npu, lfm2_npu, llama_npu, nanbeige_npu, phi4_npu, qwen2_npu, qwen2vl_npu, qwen3_5vl_npu, qwen3_6_moe_npu, qwen3_npu, qwen3vl_flash and qwen3vl_npu build and link.
  • gemma4_12b, gemma4e_flash, gemma4e_npu, qwen3_5_omni_npu, qwen3_8mtp_npu and whisper_npu still fail to link, for the reasons under "Not in this PR". None of them has registry errors left.
• The MiniCPM-V harness runs all four turns on the NPU: a prompt, a prompt-cache follow-up, a thinking prompt and an image.
• The Linux Makefiles are not tested.

Not in this PR

• gemma4_12b and qwen3_5_omni_npu CMake don't link swresample or fftw, which their audio sources need.
• qwen3_8mtp_npu CMake is missing its image sources.
• gemma4e_* and whisper_npu link libfftw3-3.lib, which src/lib ships only as a .def and .dll.

#790 adds the chat library to the same harnesses. The two PRs merge without conflicts in either order.

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