fix(cafe24): 앞 커밋에서 누락된 디자인파일 일반화 변경분 포함

config.py(Cafe24FtpConfig 일반화 + DESIGN_FILE_SPECS)·db.py(add/list_design_
revision)·router.py(design_files_router 연결)·_nav.html(탭 3개)·테스트·
.env.example·문서가 앞 커밋(8c2a9c4)에 함께 올라갔어야 하는데 스테이징 누락.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/integrations/cafe24/__init__.py

@@ -29,11 +29,14 @@ from . import design_ftp, products
 from .client import Cafe24Client
 from .config import (
     DEFAULT_SCOPES,
+    DESIGN_FILE_SPECS,
     DESIGN_SCOPES,
     ORDER_SCOPES,
     PRODUCT_SCOPES,
     Cafe24Config,
     Cafe24FtpConfig,
+    design_file_label,
+    design_file_path,
     load_config,
     load_ftp_config,
 )
@@ -56,6 +59,9 @@ __all__ = [
     "Cafe24FtpConfig",
     "load_ftp_config",
     "design_ftp",
+    "DESIGN_FILE_SPECS",
+    "design_file_label",
+    "design_file_path",
     "TokenService",
     "TokenBundle",
     "load_config",