fix(api): replace issue assignees and labels atomically

[cavidelizade]

Summary

ReplaceAssignees and ReplaceLabels did a clear-then-insert loop with no transaction, so a failed insert, or a duplicate id in the input hitting the unique constraint, left the issue with all prior rows deleted and only some new ones written. Create/Update call these and ignored the error, so the partial write went unreported.

Linked issues

Closes #341

Type of change

• Bug fix (fix:)

Surface

• API (apps/api/)

What changed

Moved the clear-and-insert into IssueStore.ReplaceAssignees / ReplaceLabels, which run in one transaction and de-dupe the input, so the operation either fully applies or rolls back. This is the same pattern ModuleStore.SetMembers already uses. The service methods now call these instead of looping.

Test plan

• go build, go vet, go test ./... green

AI assistance

• AI tools were used, tool(s): Claude Code (Opus 4.8), commits carry a Co-Authored-By: trailer

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📥 Commits

Reviewing files that changed from the base of the PR and between 61bc903 and 95f2213.

📒 Files selected for processing (2)

• apps/api/internal/service/issue.go
• apps/api/internal/store/issue.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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