Fix install-local-gpu.sh running its entire setup body twice

Commit 5c85987 appended a second copy of the toolkit-install/DNS-fix/
GPU-verify steps instead of inserting the new prerequisite-checks
section once. Removed the duplicate, keeping the more informative
GPU-check failure message from the second copy.

install-local-gpu.sh

@@ -147,88 +147,6 @@ echo "✓ Docker restarted"
 systemctl start docker-dns-fix.service
 echo "✓ DNS fix applied"
 
-# ── 5. Verify GPU access ─────────────────────────────────────────────────────
-echo ""
-echo "Verifying GPU access inside Docker..."
-if docker run --rm --gpus all nvidia/cuda:12.1.0-base-ubuntu22.04 nvidia-smi &>/dev/null; then
-    echo "✓ GPU is accessible inside Docker"
-else
-    echo "⚠ GPU check failed. Try rebooting if the driver was just installed."
-    echo "  Manual check: nvidia-smi"
-fi
-
-echo ""
-echo "=================================================="
-echo "  Setup complete."
-echo "  Start the app with:  ./bring-up-local-gpu.sh"
-echo "=================================================="
-
-if command -v nvidia-ctk &>/dev/null; then
-    echo "✓ nvidia-container-toolkit already installed — skipping"
-else
-    echo "Installing nvidia-container-toolkit..."
-    . /etc/os-release
-    case "$ID" in
-        ubuntu|debian)
-            curl -fsSL https://nvidia.github.io/libnvidia-container/gpgkey \
-                | gpg --dearmor -o /usr/share/keyrings/nvidia-ctk.gpg
-            curl -fsSL "https://nvidia.github.io/libnvidia-container/stable/deb/nvidia-container-toolkit.list" \
-                | sed 's#deb https://#deb [signed-by=/usr/share/keyrings/nvidia-ctk.gpg] https://#g' \
-                | tee /etc/apt/sources.list.d/nvidia-container-toolkit.list
-            apt-get update -qq
-            apt-get install -y nvidia-container-toolkit
-            ;;
-        rhel|fedora|rocky|centos|almalinux)
-            dnf install -y nvidia-container-toolkit
-            ;;
-        *)
-            echo "⚠ Unrecognised distro ($ID). Install nvidia-container-toolkit manually."
-            echo "  See: https://docs.nvidia.com/datacenter/cloud-native/container-toolkit/install-guide.html"
-            ;;
-    esac
-fi
-
-nvidia-ctk runtime configure --runtime=docker
-
-# ── 2. Permanent Docker DNS fix via systemd ───────────────────────────────────
-# Adds a rule to the DOCKER-USER iptables chain so containers can resolve
-# hostnames. Runs after docker.service on every boot. Does NOT touch ufw.
-echo ""
-echo "Installing docker-dns-fix systemd service..."
-
-cat > /etc/systemd/system/docker-dns-fix.service << 'EOF'
-[Unit]
-Description=Allow Docker containers to resolve DNS (DOCKER-USER iptables rule)
-After=docker.service
-Requires=docker.service
-BindsTo=docker.service
-
-[Service]
-Type=oneshot
-ExecStart=/bin/sh -c \
-  'iptables -C DOCKER-USER -p udp --dport 53 -j ACCEPT 2>/dev/null || \
-   iptables -I DOCKER-USER -p udp --dport 53 -j ACCEPT'
-RemainAfterExit=yes
-
-[Install]
-WantedBy=multi-user.target
-EOF
-
-systemctl daemon-reload
-systemctl enable docker-dns-fix.service
-echo "✓ docker-dns-fix.service installed and enabled"
-
-# ── 3. Restart Docker ─────────────────────────────────────────────────────────
-echo ""
-echo "Restarting Docker..."
-systemctl restart docker
-sleep 2
-echo "✓ Docker restarted"
-
-# ── 4. Apply DNS rule now (don't wait for next boot) ─────────────────────────
-systemctl start docker-dns-fix.service
-echo "✓ DNS fix applied"
-
 # ── 5. Verify GPU access ─────────────────────────────────────────────────────
 echo ""
 echo "Verifying GPU access inside Docker..."