feat(docs): put-xlsx with excelize cutover workbook

Add internal/xlspipe (github.com/xuri/excelize/v2) and oo docs put-xlsx
to generate multi-sheet budgets with named inputs, SUM/AVG/MIN formulas,
cross-sheet links, Russian labels, and cell comments for OnlyOffice.

Template cutover-portugal: sheets Ввод, Вс 6.09, Чт 3.09, Ср гип, Сводка.
Upload via UploadProjectFileReplacing (--replace default).

Co-authored-by: Cursor <cursoragent@cursor.com>

cmd/oo/docs.go

@@ -8,6 +8,7 @@ import (
 
 	onlyoffice "github.com/eslider/go-onlyoffice"
 	"github.com/eslider/go-onlyoffice/internal/docpipe"
+	"github.com/eslider/go-onlyoffice/internal/xlspipe"
 	"github.com/spf13/cobra"
 )
 
@@ -24,6 +25,7 @@ func docsCmd() *cobra.Command {
 OnlyOffice Documents UI is poor for .md/.txt — keep sources in git, store .docx in OO.
 Upload Markdown as DOCX:  oo docs put-md PROJECT_ID file.md
 Upload plain text:        oo docs put-txt PROJECT_ID file.txt  (preserves line breaks)
+Upload/generate XLSX:     oo docs put-xlsx PROJECT_ID [--template cutover-portugal | FILE.xlsx]
 Read an OO file as MD:    oo docs as-md FILE_ID
 OCR a scan locally:       oo docs ocr scan.pdf --md out.md
 Structured OCR (hOCR→MD): oo docs hocr scan.jpg --md out.md --yaml out.yml`,
@@ -35,6 +37,7 @@ Structured OCR (hOCR→MD): oo docs hocr scan.jpg --md out.md --yaml out.yml`,
 	cmd.AddCommand(docsAsMDCmd())
 	cmd.AddCommand(docsPutMDCmd())
 	cmd.AddCommand(docsPutTxtCmd())
+	cmd.AddCommand(docsPutXlsxCmd())
 	cmd.AddCommand(docsToolsCmd())
 	return cmd
 }
@@ -122,11 +125,11 @@ text overlays that break OnlyOffice DocEditor. Skips OCR; rewrites via gs pdfwri
 			}
 			outChars, _ := t.PDFTextLayerChars(out)
 			printObject(map[string]any{
-				"in":              in,
-				"pdf":             out,
-				"text_chars_in":   chars,
-				"text_chars_out":  outChars,
-				"note":            "native text layer preserved; no OCR overlay",
+				"in":             in,
+				"pdf":            out,
+				"text_chars_in":  chars,
+				"text_chars_out": outChars,
+				"note":           "native text layer preserved; no OCR overlay",
 			})
 			return nil
 		},
@@ -540,3 +543,118 @@ func docsPutTxtCmd() *cobra.Command {
 	cmd.Flags().BoolVar(&replace, "replace", true, "delete same-stem files in folder before upload (put-txt upsert)")
 	return cmd
 }
+
+func docsPutXlsxCmd() *cobra.Command {
+	var folderID, template, title, keepLocal string
+	var replace bool
+	cmd := &cobra.Command{
+		Use:   "put-xlsx PROJECT_ID [LOCAL_XLSX]",
+		Short: "Upload or generate an XLSX workbook into a project (excelize templates with formulas)",
+		Long: `Spreadsheets live in OnlyOffice — not in git. Generate multi-sheet workbooks with
+formulas (SUM/AVG, cross-sheet refs, named inputs) via --template, or upload an existing .xlsx.
+
+  oo docs put-xlsx 218 --template cutover-portugal
+  oo docs put-xlsx 218 --template cutover-portugal --title 2026-08-28-cutover-budget.xlsx
+  oo docs put-xlsx 218 ./my.xlsx`,
+		Args: cobra.RangeArgs(1, 2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			pid := args[0]
+			c, err := newOO(cmd)
+			if err != nil {
+				return err
+			}
+			dir, err := os.MkdirTemp("", "oo-docs-put-xlsx-*")
+			if err != nil {
+				return err
+			}
+			defer os.RemoveAll(dir)
+
+			var xlsxPath string
+			var srcLabel string
+			switch {
+			case template != "":
+				wb, err := xlspipe.BuildTemplate(template)
+				if err != nil {
+					return err
+				}
+				name := title
+				if name == "" {
+					name = "cutover-budget.xlsx"
+					if template == xlspipe.TemplateCutoverPortugal {
+						name = "2026-08-28-cutover-budget.xlsx"
+					}
+				}
+				if !strings.HasSuffix(strings.ToLower(name), ".xlsx") {
+					name += ".xlsx"
+				}
+				xlsxPath = filepath.Join(dir, name)
+				if err := xlspipe.Save(wb, xlsxPath); err != nil {
+					wb.Close()
+					return err
+				}
+				wb.Close()
+				srcLabel = "template:" + template
+			case len(args) == 2:
+				xlsxPath = args[1]
+				if docpipe.Ext(xlsxPath) != ".xlsx" {
+					return fmt.Errorf("expected .xlsx, got %s", docpipe.Ext(xlsxPath))
+				}
+				srcLabel = xlsxPath
+			default:
+				return fmt.Errorf("pass LOCAL_XLSX or --template")
+			}
+
+			if keepLocal != "" {
+				b, err := os.ReadFile(xlsxPath)
+				if err != nil {
+					return err
+				}
+				if err := docpipe.EnsureDir(keepLocal); err != nil {
+					return err
+				}
+				if err := os.WriteFile(keepLocal, b, 0o644); err != nil {
+					return err
+				}
+			}
+
+			ctx := cmd.Context()
+			var ent *onlyoffice.FileEntry
+			var deleted []int
+			if folderID != "" {
+				if replace {
+					ent, deleted, err = c.UploadToFolderReplacing(ctx, folderID, xlsxPath)
+				} else {
+					ent, err = c.UploadToFolder(ctx, folderID, xlsxPath)
+				}
+			} else {
+				if replace {
+					ent, deleted, err = c.UploadProjectFileReplacing(ctx, pid, xlsxPath)
+				} else {
+					ent, err = c.UploadProjectFile(ctx, pid, xlsxPath)
+				}
+			}
+			if err != nil {
+				return err
+			}
+			obj := map[string]any{
+				"project_id": pid,
+				"source":     srcLabel,
+				"uploaded":   fileEntryToMap(ent),
+			}
+			if folderID != "" {
+				obj["folder_id"] = folderID
+			}
+			if len(deleted) > 0 {
+				obj["replaced_file_ids"] = deleted
+			}
+			printObject(obj)
+			return nil
+		},
+	}
+	cmd.Flags().StringVar(&folderID, "folder", "", "Documents folder id (default: project root)")
+	cmd.Flags().StringVar(&template, "template", "", "built-in workbook template (cutover-portugal)")
+	cmd.Flags().StringVar(&title, "title", "", "upload file name when using --template")
+	cmd.Flags().StringVar(&keepLocal, "keep-xlsx", "", "also write generated/uploaded bytes to this local path")
+	cmd.Flags().BoolVar(&replace, "replace", true, "delete same-stem files before upload")
+	return cmd
+}