feat(providers): support model-level wire routing for OpenCode Go

[Pandakingxbc]

Summary

• Preserve model-level wire_api, endpoint, context, output, reasoning, modality, and provider-specific metadata across presets, admin/setup flows, CLI creation, persistence, and probes.
• Route OpenCode Go models explicitly through OpenAI Chat Completions, OpenAI Responses, or Anthropic Messages while keeping one stable opencode-go Provider.
• Keep legacy persisted OpenCode Go rows compatible without rewriting Provider credentials or production model selections.
• Prevent Dashboard model edits from silently dropping hidden protocol/capability metadata.

Why

OpenCode Go exposes multiple wire protocols under one Provider. The previous Provider-level protocol field routed every model through the same adapter, so Responses and Anthropic models could be constructed or probed with the wrong API.

Dependency gate

This PR intentionally declares orcakit-harness-agent[all]>=0.9.28. That version is not published yet (PyPI currently exposes 0.9.27), so this PR remains draft and dependency CI may fail until the matching harness-agent release is available. After publication, uv.lock must be regenerated to resolve 0.9.28 before merge.

Verification

• Provider/Factory/Preset/Probe unit tests: 34 passed.
• Provider draft integration tests: 5 passed.
• Changed Setup wire-metadata integration tests: 3 passed.
• Dashboard focused tests: 3 passed.
• Ruff and mypy passed for changed Python modules.
• Dashboard TypeScript build and targeted Prettier check passed.

No database migration or persisted Provider/model/Cron mutation is included.

Closes #330