feat(office): add Workspace TUI with shared bootstrap and test suite

Introduce the office Bubble Tea browser (module tree, multi-select lists,
markdown preview) alongside oo, with cmd/internal/bootstrap for shared auth,
unit tests across preview/model/ui/fetch, CI build for both binaries, and
GoReleaser archives for office.

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

cmd/office/fetch/map_test.go

@@ -0,0 +1,28 @@
+package fetch_test
+
+import (
+	"testing"
+
+	"github.com/eslider/go-onlyoffice/cmd/office/fetch"
+	"github.com/eslider/go-onlyoffice/cmd/office/model"
+)
+
+func TestItemsFromMaps(t *testing.T) {
+	rows := []map[string]any{
+		{"id": float64(1), "title": "Alpha", "status": "Open"},
+		{"id": float64(2), "title": "Beta", "status": "Closed"},
+	}
+	items := fetch.ItemsFromMaps(rows, model.KindTask, fetch.TaskItemFields)
+	if len(items) != 2 {
+		t.Fatalf("len=%d", len(items))
+	}
+	if items[0].ID != "1" || items[0].Title != "Alpha" {
+		t.Fatalf("item0=%+v", items[0])
+	}
+	if items[0].Kind != model.KindTask {
+		t.Fatalf("kind=%v", items[0].Kind)
+	}
+	if items[1].Subtitle != "Closed" {
+		t.Fatalf("subtitle=%q", items[1].Subtitle)
+	}
+}