[privatemode] sync supported models

[edgelessci]

Objective

Synchronize the models.dev Privatemode provider catalog with the models currently
published in the public Privatemode documentation.

Inspect the sources below, resolve
the complete model metadata, update the Privatemode provider TOMLs, and create a
pull request.

Authoritative sources

Use the current public Privatemode documentation:

• Supported models:
  https://docs.privatemode.ai/models/overview/

• Pricing:
  https://docs.privatemode.ai/pricing/

• Release notes:
  https://docs.privatemode.ai/release/

The supported model table is the authoritative desired model set.

Follow each model's Hugging Face link from the model overview to obtain its
upstream model identity and metadata.

Use the existing models.dev canonical catalog under models/**/*.toml to
resolve inheritance to the corresponding base_model.

Add the missing price information to the existing model catalog.

Why this issue was opened

In release v1.55.0, the following authoritative sources changed and need to be synced:

• models overview
• pricing

Allowed changes

Only modify:

• providers/privatemode-ai/models/*.toml

You may inspect:

• models/**/*.toml
• providers/privatemode-ai/models/*.toml

Do not modify canonical files under models/ in this PR.

Desired catalog

For every model ID listed in the public model overview table, ensure that this file exists
and is up to date with the backing authoritative sources:

providers/privatemode-ai/models/<model-id>.toml