[CLAUDE] App+Api+FE-User+FE-Admin+Tests: W2 KHKK — CRUD phieu nhap + can cu b.8-9 + FE 3 page x2 app + 12 fix reviewer

- BE mega-file ContractSigningPlanFeatures (Create 4-rao + auto-Lines snapshot per-winner + MaKeHoach @CREATE + UpdateDraft null-safe + Get/List/inbox-precompute-V2/deleted + Dossier + Attachments + Delete allow-list M6 + picker) + Controller 15 action policy per-action 15/15 (KeHoachKyKet.*)
- FE pages/khkk 3 page + types x2 app SHA-pair + 4-place (6 leaf Khkk_* het coming-soon; WfView: user=matrix?type=10 [whitelist +10] / admin=Designer deep-link); root KeHoachKyKet -> /khkk/list
- Reviewer adversarial: 12 finding (3 CRITICAL dut-2-bo FE-BE: route picker + peId body + dossier planId; 2 MAJOR security: detail+download 0 rao -> EnsureCanViewAsync mirror PE S89 nhap-rieng-tu; PUT-vs-POST de-ban-sao; peTenGoiThau; winnerSupplierNames; Content-Disposition RFC6266; LEFT-join Projects) -> 11 FIXED + 1 GIU (F-10 ke thua khuon PE, bit dong bo sau)
- tests: +8 (574 total 0 fail) — authz reflection dong + Create/Delete/guard/khong-dot-ma-khi-409 + fixture-co-interceptor

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/Backend/SolutionErp.Infrastructure/Persistence/Configurations/ContractSigningPlanConfiguration.cs

@@ -21,8 +21,10 @@ public class ContractSigningPlanConfiguration : IEntityTypeConfiguration<Contrac
         b.Property(x => x.HoSoLink).HasMaxLength(1000);
         b.Property(x => x.GhiChu).HasMaxLength(2000);
 
-        // Mã phiếu UNIQUE khi đã gen (gen lúc Submit ⇒ nháp còn null) — mirror
-        // PurchaseEvaluationConfiguration.cs:56 / ProposalConfiguration.cs:23.
+        // Mã phiếu UNIQUE khi đã gen — mirror PurchaseEvaluationConfiguration.cs:56 /
+        // ProposalConfiguration.cs:23. 🔴 Đính chính comment W1 ("gen lúc Submit ⇒ nháp còn
+        // null"): W2 gen NGAY LÚC TẠO ⇒ thực tế cột luôn NOT NULL. Filter GIỮ NGUYÊN (rộng
+        // hơn mức cần, không sai) — đổi filter = migration mới, không đáng.
         b.HasIndex(x => x.MaKeHoach).IsUnique().HasFilter("[MaKeHoach] IS NOT NULL");
 
         b.HasIndex(x => x.PurchaseEvaluationId);