[CLAUDE] Docs: chốt session 4 — Budget BE module + 14 Solutions users

- STATUS.md: header Phase 7 + 3 row Recently Done (Budget BE / 14 users / Docs cleanup) + cumulative cột mới (51 tables / 14 mig / ~124 endpoints)
- HANDOFF.md: TL;DR session 4 (2 milestone Budget BE + 14 users) + Cảnh báo session 5 + Priority 0 (FE Budget + PE/HD integration + PE feature gap) + Credentials 30 user
- migration-todos.md: Phase 7 thêm section D Budget done + Phase 8 mới (FE Budget pages + integration) + pending migrations Budget
- architecture.md: §10 Budget module mới (ERD + state machine + auto-recompute + integration roadmap)
- database/schema-diagram.md: migration history rows 13+14 + §12 Budget ERD chi tiết
- ef-core-migration SKILL: migration 14 entry + Phase 8 pending Budget refinement
- CLAUDE.md root + docs: modules table thêm Budget row + scope Budget + count 51 bảng / 14 mig
- Session log 2026-04-28-chot-session-4-budget.md (10+ section detailed)

Stats: 51 tables (+4 Budget), 14 migrations (+AddBudgets), ~124 endpoints (+11 Budget),
30 demo user (16 sample + 14 Solutions thật), 38 gotchas, ~340 LOC Budget CQRS.
FE Budget pages chưa làm — Priority 0 session 5.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -50,16 +50,17 @@ Kiến trúc: **.NET 10 Clean Architecture + 2 React FE (admin + user) + SQL Ser
 - Audit fields: `CreatedAt`, `UpdatedAt`, `CreatedBy`, `UpdatedBy` (`BaseEntity`)
 - Soft delete: `IsDeleted`, `DeletedAt`, `DeletedBy` (`AuditableEntity`)
 - Migrations: `dotnet ef migrations add <Name> --project src/Backend/SolutionErp.Infrastructure --startup-project src/Backend/SolutionErp.Api`
-- **Hiện có 12 migration → 46 bảng** (Phase 6 thêm migration 12 `AddPurchaseEvaluations` — 10 bảng)
+- **Hiện có 14 migration → 51 bảng** (Phase 7 thêm migration 14 `AddBudgets` — 4 bảng + 2 cột `BudgetId?` nullable trên Contracts/PurchaseEvaluations)
 
 ### Modules
 
 | Module | Namespace | Migration | Trạng thái |
 |---|---|---|---|
 | Contract (HĐ) | `Domain/Contracts/` | 1-11 | Feature-complete (7 ContractType × 9 phase) |
-| PurchaseEvaluation (Duyệt NCC tiền-HĐ) | `Domain/PurchaseEvaluations/` | 12 | **Skeleton — còn chỉnh nhiều (Phase 7 WIP)** |
+| PurchaseEvaluation (Duyệt NCC tiền-HĐ) | `Domain/PurchaseEvaluations/` | 12, 13 | UX polish complete — feature gap: Designer UI / Ý kiến 4 PB / Export PDF |
+| **Budget (Ngân sách dự án)** | `Domain/Budgets/` | **14** | **BE done — FE pages chưa làm (Priority 0 session 5)** |
 | Master (Supplier/Project/Department) | `Domain/Master/` | 2, 10 | Feature-complete |
-| Identity (User/Role/Permission/MenuItem) | `Domain/Identity/` | 1, 3, 11 | Feature-complete |
+| Identity (User/Role/Permission/MenuItem) | `Domain/Identity/` | 1, 3, 11 | Feature-complete (30 demo user — 16 sample + 14 Solutions thật) |
 | Forms (Template + Clause) | `Domain/Forms/` | 4 | Feature-complete |
 | Notifications | `Domain/Notifications/` | 6 | In-app + SignalR OK, email SMTP TODO |
 
@@ -69,7 +70,7 @@ Kiến trúc: **.NET 10 Clean Architecture + 2 React FE (admin + user) + SQL Ser
 [CLAUDE] <scope>: <imperative message>
 ```
 
-**Scope:** `Contract` · `PurchaseEvaluation` · `Form` · `Workflow` · `Supplier` · `Auth` · `Admin` · `Api` · `App` · `Domain` · `Infra` · `FE-Admin` · `FE-User` · `Docs` · `CICD` · `Scripts` · `Skill`
+**Scope:** `Contract` · `PurchaseEvaluation` · `Budget` · `Form` · `Workflow` · `Supplier` · `Auth` · `Admin` · `Api` · `App` · `Domain` · `Infra` · `FE-Admin` · `FE-User` · `Docs` · `CICD` · `Scripts` · `Skill`
 
 ## 🛠️ Skills (.claude/skills/) — 6 skill PHẢI dùng khi task khớp
 
@@ -97,7 +98,7 @@ Quy tắc: KHÔNG bulk-clone repo skill 3rd party. Chỉ thêm skill PROJECT-SPE
 | [`docs/workflow-contract.md`](docs/workflow-contract.md) | State machine 9 phase HĐ + role matrix |
 | [`docs/forms-spec.md`](docs/forms-spec.md) | Catalog 8 form + quy định mã HĐ RG-001 |
 | [`docs/database/database-guide.md`](docs/database/database-guide.md) | DB conventions + migration workflow + cheatsheet |
-| [`docs/database/schema-diagram.md`](docs/database/schema-diagram.md) | ⭐ ERD + luồng DB + data flow 46 table (+ §11 PE module) |
+| [`docs/database/schema-diagram.md`](docs/database/schema-diagram.md) | ⭐ ERD + luồng DB + data flow 51 table (+ §11 PE module + §12 Budget module) |
 | [`docs/flows/README.md`](docs/flows/README.md) | Index 6 flow (auth, permission, contract, form, SLA) |
 | [`docs/gotchas.md`](docs/gotchas.md) | ⭐ 26 bẫy đã gặp — đọc trước khi debug tương tự |
 | [`.claude/skills/`](.claude/skills/README.md) | 6 skill: contract-workflow, form-engine, permission-matrix, dependency-audit-erp, ef-core-migration, iis-deploy-runbook |