Polish customer update flow and prepare ZIP installation

__init__.py

@@ -240,7 +240,7 @@ try:
     from .utils.o1key_image_jobs import register_o1key_image_job_routes
     from .utils.o1key_image_thumbnail import register_o1key_image_thumbnail_route
     from .utils.o1key_video_jobs import register_o1key_video_job_routes
-    from .utils.updater import UpdateError, update_package
+    from .utils.updater import UpdateError, check_for_update, update_package
 
     _O1KEY_IMAGE_JOB_MANAGER = register_o1key_image_job_routes(
         PromptServer,
@@ -266,6 +266,25 @@ try:
     _o1key_restart_pending = _restart_threading.Event()
     _o1key_update_lock = _restart_threading.Lock()
 
+    @PromptServer.instance.routes.get("/o1key/update/check")
+    async def check_o1key_update(request):
+        if not _o1key_update_lock.acquire(blocking=False):
+            return web.json_response(
+                {"code": "update_in_progress", "error": "更新正在进行。"}, status=409,
+            )
+        try:
+            result = await asyncio.to_thread(check_for_update)
+            return web.json_response(result)
+        except UpdateError as exc:
+            return web.json_response(exc.as_dict(), status=exc.status)
+        except Exception:
+            logging.exception("O1Key 检查更新失败")
+            return web.json_response(
+                {"code": "internal_error", "error": "检查更新失败。"}, status=500,
+            )
+        finally:
+            _o1key_update_lock.release()
+
     @PromptServer.instance.routes.post("/o1key/update")
     async def update_o1key_package(request):
         if request.headers.get("X-O1Key-Update") != "1":