chore(deps-dev): bump @opencode-ai/plugin from 1.17.18 to 1.18.30

Bumps @opencode-ai/plugin from 1.17.18 to 1.18.30.

---
updated-dependencies:
- dependency-name: "@opencode-ai/plugin"
  dependency-version: 1.18.30
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]