The 'Remote URL' VAE type now asynchronously checks for the
ComfyUI-USCG-RemoteVAE companion plugin and renders either:
- An install card (Comfy Manager / GitHub instructions + Re-check button)
when companion is missing.
- A working preset dropdown + URL input populated from the companion's
/uscg-remote-vae/endpoints route when companion is installed.
DOM methods only - no innerHTML. Saved configs preserve their 'remote:<url>'
value either way; no data loss when companion isn't installed.