docs: Modal is missing from provider directory

[devennavani]

Description

Modal provider support is available in OpenCode, but Modal is missing from the provider directory. The directory should briefly document creating a shared Endpoint, formatting its proxy token, connecting the provider, and selecting a discovered workspace endpoint.

Plugins

None

OpenCode version

1.18.10

Steps to reproduce

1. Open https://opencode.ai/docs/providers/.
2. Search the provider directory for Modal.
3. No Modal setup instructions are present.

Screenshot and/or share link

Not applicable.

Operating System

Not applicable.

Terminal

Not applicable.