feat(mcv): Add unified container with NVIDIA and AMD support

Add mcv:unified container variant that includes both NVIDIA (CUDA/NVML)
and AMD (ROCm) GPU support. The container automatically detects the GPU
vendor at runtime, simplifying deployment across mixed GPU clusters.

Key changes:
- New mcv-unified target in amd64.dockerfile (CUDA 12.6.3 + ROCm 6.2.4)
- Updated Makefile: 'make image-unified' builds unified image
- Unified image tagged as both :unified and :latest (~1.2 GB)
- Comprehensive documentation with Kubernetes examples
- Auto-detection via MCV client library (dlopen for NVML, CLI for ROCm)

Runtime behavior:
- NVIDIA nodes: Uses NVML (libnvidia-ml.so.1) for GPU detection
- AMD nodes: Uses rocm-smi for GPU detection
- CPU nodes: Gracefully falls back to no-GPU mode

Container variants now available:
- mcv:unified (NEW DEFAULT) - NVIDIA + AMD support (~1.2 GB)
- mcv:minimal - No GPU libs (~176 MB)
- mcv:nvidia - NVIDIA only (~356 MB)
- mcv:amd - AMD only (~923 MB)

This change is backward-compatible. Existing mcv:nvidia and mcv:amd
deployments continue to work unchanged.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Maryam Tahhan <mtahhan@redhat.com>

Author: maryamtahhan

mcv/Makefile

@@ -139,7 +139,7 @@ IMAGE_NAME ?= mcv
 CONTAINER_RUNTIME = $(shell command -v docker 2>/dev/null || command -v podman 2>/dev/null)
 
 .PHONY: image-minimal
-image-minimal: ## Build minimal container image (no GPU libraries, ~176MB) - DEFAULT
+image-minimal: ## Build minimal container image (no GPU libraries, ~176MB)
 	@if [ -z "$(CONTAINER_RUNTIME)" ]; then \
 		echo "Error: No container runtime found. Please install docker or podman"; \
 		exit 1; \
@@ -148,7 +148,6 @@ image-minimal: ## Build minimal container image (no GPU libraries, ~176MB) - DEF
 	$(CONTAINER_RUNTIME) build --platform linux/amd64 \
 		--target mcv-minimal \
 		-t $(IMAGE_REGISTRY)/$(IMAGE_REPOSITORY)/$(IMAGE_NAME):minimal \
-		-t $(IMAGE_REGISTRY)/$(IMAGE_REPOSITORY)/$(IMAGE_NAME):latest \
 		-f images/amd64.dockerfile \
 		..
 
@@ -178,8 +177,22 @@ image-nvidia: ## Build NVIDIA container image (with CUDA+NVML, ~356MB)
 		-f images/amd64.dockerfile \
 		..
 
+.PHONY: image-unified
+image-unified: ## Build unified container image (with NVIDIA+AMD, ~1.2GB) - NEW DEFAULT
+	@if [ -z "$(CONTAINER_RUNTIME)" ]; then \
+		echo "Error: No container runtime found. Please install docker or podman"; \
+		exit 1; \
+	fi
+	@echo "Building unified MCV image (NVIDIA+AMD) using $(CONTAINER_RUNTIME)..."
+	$(CONTAINER_RUNTIME) build --platform linux/amd64 \
+		--target mcv-unified \
+		-t $(IMAGE_REGISTRY)/$(IMAGE_REPOSITORY)/$(IMAGE_NAME):unified \
+		-t $(IMAGE_REGISTRY)/$(IMAGE_REPOSITORY)/$(IMAGE_NAME):latest \
+		-f images/amd64.dockerfile \
+		..
+
 .PHONY: images
-images: image-minimal image-amd image-nvidia ## Build all container image variants
+images: image-unified image-minimal image-nvidia image-amd ## Build all container image variants (unified is default)
 
 .PHONY: image-push
 image-push: ## Push all container images to registry