Caching added

config.py

@@ -1,6 +1,9 @@
 # config.py
 from typing import Final
 
+# How long a cached file size stays valid.  0 = always re-probe; large = effectively forever.
+SIZE_CACHE_TTL: Final[int] = 9_999_999  # seconds (~115 days)
+
 SITES: Final[dict[str, dict[str, str]]] = {
     "jailbirdz": {
         "base_url": "https://www.jailbirdz.com",