Fix frozen settings page limit override

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

app/settings.py

@@ -140,15 +140,12 @@ def load_settings(require_secrets: bool = True) -> Settings:
         target_task_level=str(_value(config, "TARGET_TASK_LEVEL", "文本生成")),
         modelhub_page_size=_int_value(config, "MODELHUB_PAGE_SIZE", 100),
         crawler_refresh_seconds=_int_value(config, "CRAWLER_REFRESH_SECONDS", 3600),
-        crawler_max_pages=_int_value(config, "CRAWLER_MAX_PAGES", 400),
+        crawler_max_pages=max(_int_value(config, "CRAWLER_MAX_PAGES", 400), 400),
         enable_download_success_crawler=_bool_value(config, "ENABLE_DOWNLOAD_SUCCESS_CRAWLER", True),
         download_success_page_size=_int_value(config, "DOWNLOAD_SUCCESS_PAGE_SIZE", 50),
-        download_success_max_pages=_int_value(config, "DOWNLOAD_SUCCESS_MAX_PAGES", 100),
+        download_success_max_pages=max(_int_value(config, "DOWNLOAD_SUCCESS_MAX_PAGES", 100), 100),
         config_file_loaded=loaded_path,
     )
-    settings.crawler_max_pages = max(settings.crawler_max_pages, 400)
-    settings.download_success_max_pages = max(settings.download_success_max_pages, 100)
-
     if require_secrets:
         missing = []
         required_names = [