[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.Api/Controllers/ContractSigningPlansController.cs

@@ -0,0 +1,200 @@
+using MediatR;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using SolutionErp.Application.Common.Models;
+using SolutionErp.Application.ContractSigningPlans;
+using SolutionErp.Domain.ContractSigningPlans;
+
+namespace SolutionErp.Api.Controllers;
+
+// [W2 — S161 2026-07-29] REST "Kế hoạch ký kết HĐ" (GĐ2).
+//
+// 🔴 AUTHZ 2 TẦNG (gotcha #82 — menu-flag ≠ API-authz, reviewer-adversarial bắt S118):
+//   tầng 1 = class `[Authorize(Policy = "KeHoachKyKet.Read")]` (mọi endpoint tối thiểu Read)
+//   tầng 2 = per-action override `KeHoachKyKet.{Create|Update|Delete}` — GHI ĐỦ TRÊN MỌI
+//            action, kể cả action chỉ-đọc (viết lại Read cho tường minh): `[Authorize]` trần
+//            hoặc để trống = lỗ hổng, và "ẩn menu" KHÔNG đóng được API.
+//   4 policy `KeHoachKyKet.*` sinh runtime vì `KeHoachKyKet` ∈ `MenuKeys.All`
+//   (`MenuKeys.cs:42,180`) × `MenuKeys.Actions` trong `Api/Program.cs`. Key KHÔNG nằm
+//   trong `All` ⇒ 500 lúc chạy (policy không tồn tại), không phải 403.
+//
+// 🔴 KHÔNG có endpoint transition (submit/approve/reject/return) — đó là W3.
+// GlobalExceptionMiddleware map exception → ProblemDetails ⇒ TUYỆT ĐỐI không try-catch ở đây.
+[ApiController]
+[Route("api/contract-signing-plans")]
+[Authorize(Policy = "KeHoachKyKet.Read")]
+public class ContractSigningPlansController(IMediator mediator) : ControllerBase
+{
+    // ========================= Đọc =========================
+
+    [HttpGet]
+    [Authorize(Policy = "KeHoachKyKet.Read")]
+    public async Task<ActionResult<PagedResult<ContractSigningPlanListItemDto>>> List(
+        [FromQuery] ContractSigningPlanPhase? phase = null,
+        [FromQuery] Guid? projectId = null,
+        [FromQuery] Guid? purchaseEvaluationId = null,
+        [FromQuery] bool pendingMe = false,
+        [FromQuery] int page = 1,
+        [FromQuery] int pageSize = 20,
+        [FromQuery] string? search = null,
+        [FromQuery] bool sortDesc = true,
+        CancellationToken ct = default)
+        => Ok(await mediator.Send(
+            new ListContractSigningPlansQuery(phase, projectId, purchaseEvaluationId, pendingMe)
+            { Page = page, PageSize = pageSize, Search = search, SortDesc = sortDesc }, ct));
+
+    /// Inbox "chờ tôi duyệt" — wire sẵn cho W3 (W2 trả rỗng vì chưa có đường trình duyệt).
+    [HttpGet("inbox")]
+    [Authorize(Policy = "KeHoachKyKet.Read")]
+    public async Task<ActionResult<List<ContractSigningPlanListItemDto>>> Inbox(CancellationToken ct)
+        => Ok(await mediator.Send(new GetMyContractSigningPlanInboxQuery(), ct));
+
+    /// Màn "Đã xoá" — CHỈ XEM.
+    [HttpGet("deleted")]
+    [Authorize(Policy = "KeHoachKyKet.Read")]
+    public async Task<ActionResult<PagedResult<ContractSigningPlanListItemDto>>> ListDeleted(
+        [FromQuery] int page = 1,
+        [FromQuery] int pageSize = 20,
+        [FromQuery] string? search = null,
+        [FromQuery] bool sortDesc = true,
+        CancellationToken ct = default)
+        => Ok(await mediator.Send(new ListDeletedContractSigningPlansQuery
+        { Page = page, PageSize = pageSize, Search = search, SortDesc = sortDesc }, ct));
+
+    /// Picker màn tạo: phiếu Duyệt NCC đã duyệt, có NCC trúng thầu, chưa có kế hoạch sống.
+    [HttpGet("approved-pe-awaiting-plan")]
+    [Authorize(Policy = "KeHoachKyKet.Read")]
+    public async Task<ActionResult<List<ApprovedPeAwaitingPlanDto>>> ListApprovedPeAwaitingPlan(
+        CancellationToken ct)
+        => Ok(await mediator.Send(new ListApprovedPeAwaitingPlanQuery(), ct));
+
+    [HttpGet("{id:guid}")]
+    [Authorize(Policy = "KeHoachKyKet.Read")]
+    public async Task<ActionResult<ContractSigningPlanDetailDto>> Get(Guid id, CancellationToken ct)
+        => Ok(await mediator.Send(new GetContractSigningPlanQuery(id), ct));
+
+    // ========================= Ghi header =========================
+
+    [HttpPost]
+    [Authorize(Policy = "KeHoachKyKet.Create")]
+    public async Task<ActionResult<CreateContractSigningPlanResult>> Create(
+        [FromBody] CreateContractSigningPlanCommand cmd, CancellationToken ct)
+    {
+        var result = await mediator.Send(cmd, ct);
+        return CreatedAtAction(nameof(Get), new { id = result.Id }, result);
+    }
+
+    [HttpPut("{id:guid}")]
+    [Authorize(Policy = "KeHoachKyKet.Update")]
+    public async Task<IActionResult> UpdateDraft(
+        Guid id, [FromBody] UpdateContractSigningPlanDraftBody body, CancellationToken ct)
+    {
+        await mediator.Send(new UpdateContractSigningPlanDraftCommand(
+            id, body.GhiChu, body.HoSoLink, body.ApprovalWorkflowId), ct);
+        return NoContent();
+    }
+
+    [HttpDelete("{id:guid}")]
+    [Authorize(Policy = "KeHoachKyKet.Delete")]
+    public async Task<IActionResult> Delete(
+        Guid id, [FromQuery] string? reason = null, CancellationToken ct = default)
+    {
+        await mediator.Send(new DeleteContractSigningPlanCommand(id, reason), ct);
+        return NoContent();
+    }
+
+    // ================= Căn cứ b.8-9 (dossier items) =================
+    // Ghi vào phiếu ⇒ policy Update (KHÔNG Create): "tạo" ở module này = tạo PHIẾU.
+
+    [HttpPost("{id:guid}/dossier-items")]
+    [Authorize(Policy = "KeHoachKyKet.Update")]
+    public async Task<ActionResult<object>> CreateDossierItem(
+        Guid id, [FromBody] UpsertContractSigningPlanDossierItemCommand cmd, CancellationToken ct)
+    {
+        if (id != cmd.ContractSigningPlanId)
+            return BadRequest(new { detail = "ID kế hoạch trên đường dẫn không khớp dữ liệu gửi lên." });
+        var newId = await mediator.Send(cmd with { Id = null }, ct);
+        return Ok(new { id = newId });
+    }
+
+    [HttpPut("{id:guid}/dossier-items/{itemId:guid}")]
+    [Authorize(Policy = "KeHoachKyKet.Update")]
+    public async Task<ActionResult<object>> UpdateDossierItem(
+        Guid id, Guid itemId,
+        [FromBody] UpsertContractSigningPlanDossierItemCommand cmd, CancellationToken ct)
+    {
+        if (id != cmd.ContractSigningPlanId)
+            return BadRequest(new { detail = "ID kế hoạch trên đường dẫn không khớp dữ liệu gửi lên." });
+        var savedId = await mediator.Send(cmd with { Id = itemId }, ct);
+        return Ok(new { id = savedId });
+    }
+
+    [HttpDelete("{id:guid}/dossier-items/{itemId:guid}")]
+    [Authorize(Policy = "KeHoachKyKet.Update")]
+    public async Task<IActionResult> DeleteDossierItem(Guid id, Guid itemId, CancellationToken ct)
+    {
+        await mediator.Send(new DeleteContractSigningPlanDossierItemCommand(id, itemId), ct);
+        return NoContent();
+    }
+
+    // ===================== Đính kèm (mở mọi phase) =====================
+
+    [HttpPost("{id:guid}/attachments")]
+    [Authorize(Policy = "KeHoachKyKet.Update")]
+    [RequestSizeLimit(25_000_000)]
+    public async Task<ActionResult<ContractSigningPlanAttachmentDto>> UploadAttachment(
+        Guid id,
+        IFormFile file,
+        [FromForm] Guid? dossierItemId = null,
+        [FromForm] ContractSigningPlanAttachmentPurpose purpose = ContractSigningPlanAttachmentPurpose.DossierScan,
+        [FromForm] string? note = null,
+        CancellationToken ct = default)
+    {
+        if (file is null || file.Length == 0)
+            return BadRequest(new { detail = "Chưa chọn file." });
+
+        await using var stream = file.OpenReadStream();
+        var dto = await mediator.Send(new UploadContractSigningPlanAttachmentCommand(
+            id, dossierItemId, file.FileName, file.ContentType, file.Length, stream, purpose, note), ct);
+        return Ok(dto);
+    }
+
+    [HttpGet("{id:guid}/attachments/{attId:guid}/download")]
+    [Authorize(Policy = "KeHoachKyKet.Read")]
+    public async Task<IActionResult> DownloadAttachment(Guid id, Guid attId, CancellationToken ct)
+    {
+        var f = await mediator.Send(new DownloadContractSigningPlanAttachmentQuery(id, attId), ct);
+        return File(f.Content, f.ContentType, f.FileName);
+    }
+
+    /// Xem inline (PDF iframe / ảnh) — cùng handler download, khác Content-Disposition.
+    [HttpGet("{id:guid}/attachments/{attId:guid}/view")]
+    [Authorize(Policy = "KeHoachKyKet.Read")]
+    public async Task<IActionResult> ViewAttachment(Guid id, Guid attId, CancellationToken ct)
+    {
+        var f = await mediator.Send(new DownloadContractSigningPlanAttachmentQuery(id, attId), ct);
+        // [W2 S161 — reviewer F-11] KHÔNG nội suy FileName thô vào header: tên có dấu/ký tự `"`
+        // làm header non-ASCII/vỡ cú pháp. ContentDispositionHeaderValue tự mã hoá RFC 6266
+        // (filename*) — cùng cơ chế MVC dùng cho đường /download.
+        var cd = new Microsoft.Net.Http.Headers.ContentDispositionHeaderValue("inline");
+        cd.SetHttpFileName(f.FileName);
+        Response.Headers.ContentDisposition = cd.ToString();
+        return File(f.Content, f.ContentType);
+    }
+
+    [HttpDelete("{id:guid}/attachments/{attId:guid}")]
+    [Authorize(Policy = "KeHoachKyKet.Update")]
+    public async Task<IActionResult> DeleteAttachment(Guid id, Guid attId, CancellationToken ct)
+    {
+        await mediator.Send(new DeleteContractSigningPlanAttachmentCommand(id, attId), ct);
+        return NoContent();
+    }
+
+    // ========================= Body records =========================
+    // PUT header: KHÔNG mang `Id` trong body (id lấy từ route) — tránh 2 nguồn sự thật.
+    // Mọi field nullable = null-safe: client không gửi ⇒ giữ giá trị cũ (#73).
+    public record UpdateContractSigningPlanDraftBody(
+        string? GhiChu = null,
+        string? HoSoLink = null,
+        Guid? ApprovalWorkflowId = null);
+}