VPA coverage (D-012): Off-mode VPAs + right-size sd-webui-rcom

[dvystrcil-ci-cd]

Phase-1 child of https://github.com/dvystrcil/homelab/issues/455.

Acceptance criteria

• AC1: Off-mode VPAs for: sd-webui-rcom — Synced+Healthy
• AC2: all report PROVIDED=True
• AC3: after a representative-load window, requests right-sized from recommendations in a reviewed commit (check for request-coupled runtime flags first)
• AC4: workloads with no requests at all get explicit requests in the same commit