Revert "telegram"

This reverts commit 46daf3d4aa.

rest/controllers/proyecto_controller.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"math"
 	"mime/multipart"
+	"net/url"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -491,10 +492,25 @@ func DownloadDocumento(c *fiber.Ctx) error {
 	if !strings.HasPrefix(clean, "uploads/") {
 		return c.Status(403).JSON(fiber.Map{"error": "Acceso denegado"})
 	}
-	c.Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, item.OriginalName))
+	nombre := item.OriginalName
+	if nombre == "" {
+		nombre = item.Nombre
+	}
+	c.Set("Content-Disposition", attachmentDisposition(nombre))
 	return c.SendFile(clean)
 }
 
+// attachmentDisposition genera un header Content-Disposition con fallback ASCII y encoding RFC 5987.
+func attachmentDisposition(name string) string {
+	safe := strings.Map(func(r rune) rune {
+		if r > 127 || r == '"' || r == '\\' || r == '/' || r == '\n' || r == '\r' {
+			return '_'
+		}
+		return r
+	}, name)
+	return fmt.Sprintf(`attachment; filename="%s"; filename*=UTF-8''%s`, safe, url.PathEscape(name))
+}
+
 // ─── Tickets (admin) ──────────────────────────────────────────────────────────
 
 func GetTickets(c *fiber.Ctx) error {