screenshot_config: cache_ttl is int (seconds), not bool

ScreenshotConfig declared cache_ttl as Optional[bool] in both the field
annotation and the __init__ signature, but the scrape API requires an
integer TTL. Sending anything other than an int raises
ERR::SCRAPE::CONFIG_ERROR at the API layer.

ScrapeConfig.cache_ttl is already typed as int; align the screenshot
config to the same shape.

Author: jjsaunier

scrapfly/screenshot_config.py

@@ -71,7 +71,7 @@ class ScreenshotConfig(BaseApiConfig):
     auto_scroll: Optional[bool] = None
     js: Optional[str] = None
     cache: Optional[bool] = None
-    cache_ttl: Optional[bool] = None
+    cache_ttl: Optional[int] = None
     cache_clear: Optional[bool] = None
     webhook: Optional[str] = None
     raise_on_upstream_error: bool = True
@@ -90,7 +90,7 @@ def __init__(
         auto_scroll: Optional[bool] = None,
         js: Optional[str] = None,
         cache: Optional[bool] = None,
-        cache_ttl: Optional[bool] = None,
+        cache_ttl: Optional[int] = None,
         cache_clear: Optional[bool] = None,
         vision_deficiency: Optional[VisionDeficiency] = None,
         webhook: Optional[str] = None,