feat: smart federation routing (load + VRAM + model + prefix affinity + cross-server sync) and unified Cluster UI #19614

Job	Run time
detect-changes	11s
tests-llama-cpp-smoke	1m 9s
tests-coqui	0s
tests-qwen-asr	0s
tests-liquid-audio	0s
tests-pocket-tts	0s
tests-voxcpm	0s
tests-llama-cpp-quantization	0s
tests-vibevoice-cpp-grpc-transcription	0s
tests-acestep-cpp	0s
tests-parakeet-cpp-grpc-transcription	0s
tests-transformers	0s
tests-diffusers	0s
tests-nemo	0s
tests-qwen3-tts-cpp	0s
tests-llama-cpp-grpc-transcription	0s
tests-kokoros	0s
tests-sherpa-onnx-realtime	0s
tests-speaker-recognition-grpc	0s
tests-rfdetr-cpp	0s
tests-sherpa-onnx-grpc-tts	0s
tests-insightface-grpc	0s
tests-whisper-grpc-transcription	0s
tests-turboquant-grpc	0s
tests-qwen-tts	-1s
tests-localvqe-grpc-transform	-1s
tests-voxtral	-1s
tests-vibevoice-cpp	-1s
tests-ik-llama-cpp-grpc	-1s
tests-rerankers	-1s
tests-vibevoice-cpp-grpc-tts	-1s
tests-llama-cpp-grpc	-1s
tests-sherpa-onnx-grpc-transcription	-1s
tests-moonshine	-1s
	1m 10s

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