**Bumps both pibox services to `v0.16.2`, which fixes every advertised model
except the default one failing on each request.**

- pibox image bumped `v0.16.1` to `v0.16.2`. On v0.16.1 only
  `PIBOX_PROVIDER_MODEL` was registered in Pi's provider model list, so any
  other model in `PIBOX_AVAILABLE_MODELS` fell back to Pi's default API shape,
  disagreed with the configured provider base URL, and failed with
  `Stream ended without finish_reason`. Both services shipped in v5.1.0 with
  this fault: `pibox-zai` served `glm-5.3-flash` but not `glm-5.3`, and `pibox`
  served only its default model out of everything listed in `PIBOX_MODELS`.
  Picking a model from the advertised list is the point of these services, so
  v5.1.0 should be skipped. v0.16.2 registers every advertised model under the
  configured `PIBOX_PROVIDER_API`, and warns at startup when the provider base
  URL and API protocol describe different protocols rather than surfacing the
  mismatch as a truncated stream at request time.