fix: remove --voxcpm2-base-lm/acoustic args (not valid for llama-server CLI)

test_omni: add stderr capture on startup failure

fix: rewrite test_omni to use llama-server built-in omni endpoints

refactor: deprecate llama-omni-server, use llama-server built-in omni endpoints

test_omni: add stderr capture for omni-server when init fails

tmp: health check / omni test scripts for debugging omni_init 500

fix: set params.model/vpm/apm/tts in server-omni.cpp omni_init handler so model files are found

modal/omni: add llama-omni-server for full-duplex voice API

modal/omni: text inference verified (Chinese OK, English needs fix)

modal/omni: llama-server inference verified on T4

deploy_omni: llFile llama.cpp-omni compile succeeds on Modal T4

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