[CLAUDE] App+Infra+FE-Admin: DynamicForm + .doc/.xls auto-convert on upload

Tier 3 iter2 — form builder UI dùng FieldSpec thay raw JSON textarea.

FE:
- DynamicForm component — parse FieldSpec JSON (record of FieldDef với
  label/type/required/placeholder/hint/options) và render inputs
  dynamic theo type: text/textarea/number/date/currency/select.
- FormsPage render dialog thêm toggle Form ↔ JSON (segmented control).
  Mặc định Form mode khi template có FieldSpec, JSON mode khi không.
  Khi mở dialog cho row khác, reset formValues + chọn đúng default mode.
- parseFieldSpec helper trả { spec, error } — UI báo lỗi nếu JSON
  không parse được, fallback JSON textarea.

BE — generalize converter thành IDocumentConverter:
- IPdfConverter → IDocumentConverter (ConvertAsync(bytes, src, tgt, ct))
  — đủ gánh cả pdf, docx, xlsx targets.
- LibreOfficeDocumentConverter — 1 shell-out pattern cho mọi conversion
  (docx→pdf, doc→docx, xls→xlsx, xlsx→pdf), target arg truyền vào
  --convert-to.
- ExportTemplatePdfCommand update dùng "pdf" target.

Auto-convert .doc/.xls trên upload:
- Validator accept thêm .doc/.xls (thêm note "sẽ tự convert").
- UploadContractTemplateCommandHandler: nếu ext là doc/xls → read stream
  → converter.ConvertAsync → lưu file .docx/.xlsx thay vì format gốc.
  File rendering pipeline (DocxRenderer/XlsxRenderer) chỉ support docx/
  xlsx — convert đảm bảo consistent.
- Display FileName preserve original name nhưng đổi extension.

Unblock 3 file .doc legacy template — admin giờ upload .doc bình thường,
system tự convert.

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

src/Backend/SolutionErp.Infrastructure/DependencyInjection.cs

@@ -29,7 +29,7 @@ public static class DependencyInjection
         services.AddScoped<IJwtTokenService, JwtTokenService>();
 
         services.AddSingleton<IFormRenderer, FormRenderer>();
-        services.AddSingleton<IPdfConverter, LibreOfficePdfConverter>();
+        services.AddSingleton<IDocumentConverter, LibreOfficeDocumentConverter>();
         services.AddScoped<IContractCodeGenerator, ContractCodeGenerator>();
         services.AddScoped<IContractWorkflowService, ContractWorkflowService>();
         services.AddScoped<IContractExcelExporter, ContractExcelExporter>();

src/Backend/SolutionErp.Infrastructure/Forms/LibreOfficePdfConverter.cs

@@ -5,11 +5,12 @@ using SolutionErp.Application.Common.Interfaces;
 
 namespace SolutionErp.Infrastructure.Forms;
 
-// Shells out to LibreOffice headless to convert .docx/.xlsx → PDF.
-// Requires soffice.exe installed on the host. Config Pdf:SofficePath overrides
-// the default "C:\Program Files\LibreOffice\program\soffice.exe" / "soffice"
-// so dev on macOS/Linux can point to a different binary.
-public class LibreOfficePdfConverter(IConfiguration config, ILogger<LibreOfficePdfConverter> logger) : IPdfConverter
+// Shells out to LibreOffice headless for arbitrary .docx/.doc/.xlsx/.xls →
+// pdf/docx conversion. Requires soffice.exe installed on the host. Config
+// Pdf:SofficePath overrides default path for cross-platform dev.
+public class LibreOfficeDocumentConverter(
+    IConfiguration config,
+    ILogger<LibreOfficeDocumentConverter> logger) : IDocumentConverter
 {
     private readonly string _sofficePath = config["Pdf:SofficePath"]
         ?? (OperatingSystem.IsWindows()
@@ -19,19 +20,22 @@ public class LibreOfficePdfConverter(IConfiguration config, ILogger<LibreOfficeP
     private readonly TimeSpan _timeout = TimeSpan.FromSeconds(
         config.GetValue<int?>("Pdf:TimeoutSeconds") ?? 60);
 
-    public async Task<byte[]> ConvertAsync(byte[] sourceBytes, string sourceExt, CancellationToken ct = default)
+    public async Task<byte[]> ConvertAsync(byte[] sourceBytes, string sourceExt, string targetExt, CancellationToken ct = default)
     {
-        var ext = sourceExt.TrimStart('.').ToLowerInvariant();
-        if (ext != "docx" && ext != "xlsx" && ext != "doc" && ext != "xls")
-            throw new InvalidOperationException($"Unsupported source extension: {ext}");
+        var srcExt = sourceExt.TrimStart('.').ToLowerInvariant();
+        var tgtExt = targetExt.TrimStart('.').ToLowerInvariant();
+        if (srcExt is not ("docx" or "xlsx" or "doc" or "xls"))
+            throw new InvalidOperationException($"Unsupported source extension: {srcExt}");
+        if (tgtExt is not ("pdf" or "docx" or "xlsx"))
+            throw new InvalidOperationException($"Unsupported target extension: {tgtExt}");
 
-        // Per-conversion temp directory — avoids filename collisions when multiple
-        // requests run concurrently and makes cleanup atomic.
-        var workDir = Path.Combine(Path.GetTempPath(), "solutionerp-pdf", Guid.NewGuid().ToString("N"));
+        // Per-conversion temp directory — avoids filename collisions when
+        // multiple requests run concurrently and makes cleanup atomic.
+        var workDir = Path.Combine(Path.GetTempPath(), "solutionerp-conv", Guid.NewGuid().ToString("N"));
         Directory.CreateDirectory(workDir);
-        var inputName = $"input.{ext}";
+        var inputName = $"input.{srcExt}";
         var inputPath = Path.Combine(workDir, inputName);
-        var outputPath = Path.Combine(workDir, "input.pdf");
+        var outputPath = Path.Combine(workDir, $"input.{tgtExt}");
 
         try
         {
@@ -43,8 +47,8 @@ public class LibreOfficePdfConverter(IConfiguration config, ILogger<LibreOfficeP
                 // --headless: no GUI
                 // --norestore: don't try to resurrect prior session
                 // -env:UserInstallation: isolate user profile per worker (avoids
-                //   "soffice already running" conflict when multiple requests hit)
-                Arguments = $"--headless --norestore --convert-to pdf " +
+                //   "soffice already running" conflict when concurrent)
+                Arguments = $"--headless --norestore --convert-to {tgtExt} " +
                             $"-env:UserInstallation=file:///{workDir.Replace('\\', '/')}/profile " +
                             $"--outdir \"{workDir}\" \"{inputPath}\"",
                 UseShellExecute = false,
@@ -74,12 +78,13 @@ public class LibreOfficePdfConverter(IConfiguration config, ILogger<LibreOfficeP
             {
                 var stderr = await proc.StandardError.ReadToEndAsync(ct);
                 var stdout = await proc.StandardOutput.ReadToEndAsync(ct);
-                logger.LogError("soffice exit {Code}. stderr={Stderr} stdout={Stdout}", proc.ExitCode, stderr, stdout);
+                logger.LogError("soffice {Src}→{Tgt} exit {Code}. stderr={Stderr} stdout={Stdout}",
+                    srcExt, tgtExt, proc.ExitCode, stderr, stdout);
                 throw new InvalidOperationException($"LibreOffice conversion failed (exit {proc.ExitCode}).");
             }
 
             if (!File.Exists(outputPath))
-                throw new InvalidOperationException("LibreOffice did not produce a PDF output.");
+                throw new InvalidOperationException($"LibreOffice did not produce {tgtExt} output.");
 
             return await File.ReadAllBytesAsync(outputPath, ct);
         }