Service `ApproveV2Async` sau khi log approval (Decision=Approve) → UPSERT
row `PurchaseEvaluationLevelOpinions` cho Cấp hiện tại (auto sync ý kiến
từ comment khi duyệt). Reject KHÔNG sync.
Match level theo ApproverUserId của actor (multi-NV cùng Cấp OR-of-N).
Admin override (actor.Id KHÔNG match) → fallback first level — FE detect
SignedByUserId !== Level.ApproverUserId hiển thị "Admin duyệt thay".
Empty/whitespace comment → "(duyệt — không ý kiến)" placeholder (Q4 bonus).
Helper `ResolveActorFullNameAsync(actorUserId, isSystem, ct)` lookup
denorm SignedByFullName từ Users (fallback "(System)" / "(unknown)").
DTO `PurchaseEvaluationLevelOpinionDto` (15 fields):
- StepOrder/StepName/StepDepartmentId/StepDepartmentName (Bước Phòng)
- LevelOrder/LevelName/ApproverUserId/ApproverFullName (Cấp NV)
- Comment/SignedAt/SignedByUserId/SignedByFullName (sign-off)
GetPurchaseEvaluationQueryHandler:
- Include LevelOpinions
- helper BuildLevelOpinionsAsync JOIN ApprovalWorkflows.Steps.Levels +
Departments + Users → denorm DTO. Empty list cho phiếu V1 / V2 chưa
có cấp nào duyệt → FE fallback message.
Verify: dotnet build pass + dotnet test 81 pass (no regression).
Chunk C kế tiếp: FE Section 5 dynamic mirror 2 app.
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