feat: show Detail fix PR on bugs list and show views

[tjdammann]

What

Renders the Detail-generated fix PR (fixPr) on the bugs views, now that the public API exposes it.

• bugs list (table + --format json): a compact Fix PR #<number> (<state>) row, alongside the existing Introduced / Linked Issues rows.
• bugs show: a Fix PR #<number> (<state>) — <url> row, next to the per-issue rows.

fixPr is optional — bugs without a Detail fix PR simply omit the row (the field is only populated for repos with the bug-fix workflow enabled).

Changes

• openapi.json: regenerated via cargo xtask generate-openapi — picks up the new optional Bug.fixPr + FixPr schema.
• src/api/types.rs: re-export FixPr, add a format_fix_pr helper, add the Fix PR row to the Bug list card, plus unit tests.
• src/commands/bugs.rs: add the Fix PR row (with URL) to render_bug_show.

Verification

• cargo xtask check (openapi.json matches upstream, HELP.md up to date), cargo fmt --check, cargo clippy -- -D warnings, cargo build, cargo test — all green.
• Smoke-tested the built binary against the live API: bugs list shows #13922 (open) / #13921 (closed), and bugs show shows #13599 (merged) — https://github.com/usedetail/detail/pull/13599 — across all three states.

Backend side (exposes the field): usedetail/detail#14560 (merged + deployed).

🤖 Generated with Claude Code

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[cubic-dev-ai]

No issues found across 3 files

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