Support OpenCode Go/Zen please, it provides DeepSeek-V4 as well.

[seanthefuturegorilla]

Problem

Now DeepSeek-TUI does not support OpenCode Go/Zen as DeepSeek provider

Proposed solution

Support OpenCode Go/Zen, they provides DeepSeek-V4 as well, and it is very cheap.

Alternatives considered

Additional context

[Hiyajomaho-num9]

The DeepSeek API in opencode-go actually uses the OpenAI Chat compatibility mode and offers native support.

[diegovskytl]

opencode go also provides access for other open models codewhale supports. having it as a canonic provider would be very useful :) i guess related to #2478

[Hmbown]

Implementation candidate PR #3781 is open and has been placed in the same v0.9.3 milestone. It is currently conflicting with main, so the canonical issue should remain open until the provider, Responses wire behavior, model catalog, docs, and route tests are reconciled and merged.