v1.0.0 — per-service CUDA flags replace global CUDA=1

Breaking: CUDA=1 no longer exists. Replace with:
- OLLAMA_CUDA=1 (GPU inference)
- SDCPP_CUDA=1 (GPU image generation)
- SPEACHES_CUDA=1 (GPU STT)
- QWEN_TTS_CUDA=1 (GPU TTS)

Each CUDA service is now independently toggleable.