feat(models): refresh model catalog hourly instead of daily (#35756)

Lower the model_catalog disk-cache TTL from 24h to 1h so freshly
published model-catalog.json deploys reach the picker within an hour
instead of up to a day. The picker now refetches on the next
`hermes model` / `/model` once the cache is older than 1h; younger
than 1h still serves the cache (no network hit), and network failures
still fall back to the stale copy.

- DEFAULT_TTL_HOURS 24 -> 1 (model_catalog.py)
- DEFAULT_CONFIG model_catalog.ttl_hours 24 -> 1, _config_version 24 -> 25
- migration v24->25 rewrites a stale ttl_hours:24 to 1, preserving any
  custom value the user set

E2E: verified >1h refetches / <1h skips, and migration rewrites 24->1
while preserving a custom 6.

hermes_cli/model_catalog.py

@@ -73,7 +73,7 @@ DEFAULT_CATALOG_URL = (
 DEFAULT_CATALOG_FALLBACK_URLS: tuple[str, ...] = (
     "https://raw.githubusercontent.com/NousResearch/hermes-agent/main/website/static/api/model-catalog.json",
 )
-DEFAULT_TTL_HOURS = 24
+DEFAULT_TTL_HOURS = 1
 DEFAULT_FETCH_TIMEOUT = 8.0
 SUPPORTED_SCHEMA_VERSION = 1