fix: show full installer output instead of filtering

The setup script was filtering installer output to only show lines with
✓|⚠️|ERROR, which hid successful download messages like:
'Downloading pulse-sensor-proxy-linux-amd64 from Pulse server...'

This made it appear the installer failed even when the Pulse server
fallback download succeeded. Changed to show all installer output for
better visibility and debugging.

Users will now see the complete installation flow including:
- GitHub download attempt (expected to fail for dev builds)
- Pulse server fallback download (should succeed)
- All setup steps and validations

Improves transparency and reduces confusion during setup

internal/api/config_handlers.go

@@ -3712,7 +3712,7 @@ if [ "$TEMP_MONITORING_AVAILABLE" = true ] && [ "$PULSE_IS_CONTAINERIZED" = true
             INSTALL_STATUS=$?
 
             if [ -n "$INSTALL_OUTPUT" ]; then
-                echo "$INSTALL_OUTPUT" | grep -E "✓|⚠️|ERROR" || true
+                echo "$INSTALL_OUTPUT"
             fi
 
             if [ $INSTALL_STATUS -eq 0 ]; then