Fix temperature monitoring for standalone Proxmox nodes and add multi-arch sensor proxy builds

Related to #571

This addresses multiple temperature monitoring issues:

1. Fix single-node Proxmox installation failure: Add '|| true' to pvecm status
   calls to prevent script exit on standalone (non-clustered) nodes with
   'set -euo pipefail'. The script now properly falls through to standalone
   node configuration when cluster detection fails.

2. Build pulse-sensor-proxy for all Linux architectures (amd64, arm64, armv7)
   in Dockerfile to ensure binaries are available for download on all supported
   platforms. This resolves the missing binary issue from v4.23.0.

Note: AMD Tctl sensor support was already implemented in a previous commit.

Dockerfile

@@ -105,13 +105,22 @@ RUN --mount=type=cache,id=pulse-go-mod,target=/go/pkg/mod \
       -trimpath \
       -o pulse-host-agent-windows-amd64.exe ./cmd/pulse-host-agent
 
-# Build pulse-sensor-proxy
+# Build pulse-sensor-proxy for all Linux architectures (for download endpoint)
 RUN --mount=type=cache,id=pulse-go-mod,target=/go/pkg/mod \
     --mount=type=cache,id=pulse-go-build,target=/root/.cache/go-build \
-    CGO_ENABLED=0 GOOS=linux go build \
+    CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
       -ldflags="-s -w" \
       -trimpath \
-      -o pulse-sensor-proxy ./cmd/pulse-sensor-proxy
+      -o pulse-sensor-proxy-linux-amd64 ./cmd/pulse-sensor-proxy && \
+    CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build \
+      -ldflags="-s -w" \
+      -trimpath \
+      -o pulse-sensor-proxy-linux-arm64 ./cmd/pulse-sensor-proxy && \
+    CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=7 go build \
+      -ldflags="-s -w" \
+      -trimpath \
+      -o pulse-sensor-proxy-linux-armv7 ./cmd/pulse-sensor-proxy && \
+    cp pulse-sensor-proxy-linux-amd64 pulse-sensor-proxy
 
 # Runtime image for the Docker agent (offered via --target agent_runtime)
 FROM alpine:3.20 AS agent_runtime
@@ -188,7 +197,10 @@ COPY --from=backend-builder /app/pulse-host-agent-windows-amd64.exe /opt/pulse/b
 # Create symlink for Windows without .exe extension
 RUN ln -s pulse-host-agent-windows-amd64.exe /opt/pulse/bin/pulse-host-agent-windows-amd64
 
-# Copy pulse-sensor-proxy binary for download endpoint
+# Copy multi-arch pulse-sensor-proxy binaries for download endpoint
+COPY --from=backend-builder /app/pulse-sensor-proxy-linux-amd64 /opt/pulse/bin/
+COPY --from=backend-builder /app/pulse-sensor-proxy-linux-arm64 /opt/pulse/bin/
+COPY --from=backend-builder /app/pulse-sensor-proxy-linux-armv7 /opt/pulse/bin/
 COPY --from=backend-builder /app/pulse-sensor-proxy /opt/pulse/bin/pulse-sensor-proxy
 
 # Create config directory

scripts/install-sensor-proxy.sh

@@ -101,7 +101,7 @@ cleanup_cluster_authorized_keys_manual() {
     if command -v pvecm >/dev/null 2>&1; then
         while IFS= read -r node_ip; do
             [[ -n "$node_ip" ]] && nodes+=("$node_ip")
-        done < <(pvecm status 2>/dev/null | awk '/0x[0-9a-f]+.*[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ {print $3}')
+        done < <(pvecm status 2>/dev/null | awk '/0x[0-9a-f]+.*[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ {print $3}' || true)
     fi
 
     if [[ ${#nodes[@]} -eq 0 ]]; then
@@ -841,7 +841,7 @@ if [[ -z "$HOST" ]]; then
 
     # Discover cluster nodes
     if command -v pvecm >/dev/null 2>&1; then
-        CLUSTER_NODES=$(pvecm status 2>/dev/null | awk '/0x[0-9a-f]+.*[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ {print $3}')
+        CLUSTER_NODES=$(pvecm status 2>/dev/null | awk '/0x[0-9a-f]+.*[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ {print $3}' || true)
 
         if [[ -n "$CLUSTER_NODES" ]]; then
             for node_ip in $CLUSTER_NODES; do
@@ -1016,7 +1016,7 @@ print_info "Proxy public key: ${PROXY_PUBLIC_KEY:0:50}..."
 # Discover cluster nodes
 if command -v pvecm >/dev/null 2>&1; then
     # Extract node IPs from pvecm status
-    CLUSTER_NODES=$(pvecm status 2>/dev/null | awk '/0x[0-9a-f]+.*[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ {print $3}')
+    CLUSTER_NODES=$(pvecm status 2>/dev/null | awk '/0x[0-9a-f]+.*[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ {print $3}' || true)
 
     if [[ -n "$CLUSTER_NODES" ]]; then
         print_info "Discovered cluster nodes: $(echo $CLUSTER_NODES | tr '\n' ' ')"

scripts/pulse-sensor-cleanup.sh

@@ -50,7 +50,7 @@ if [[ -z "$HOST" ]]; then
 
     # Discover cluster nodes
     if command -v pvecm >/dev/null 2>&1; then
-        CLUSTER_NODES=$(pvecm status 2>/dev/null | awk '/0x[0-9a-f]+.*[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ {print $3}')
+        CLUSTER_NODES=$(pvecm status 2>/dev/null | awk '/0x[0-9a-f]+.*[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ {print $3}' || true)
 
         if [[ -n "$CLUSTER_NODES" ]]; then
             for node_ip in $CLUSTER_NODES; do