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The layer content cache was a single directory, so every source of pre-converted blobs had to be merged into one tree. A shared read-only fleet cache, a host-local cache, and a per-image warm cache could not coexist. Replace layer_content_cache with layer_content_caches, a list. Each directory is checked in order and the first hit is staged into the snapshot; a layer found in none of them falls back to the normal download-and-convert path. Cache directories are no longer required to exist at startup. A missing one is indistinguishable from an empty one at lookup time (both are simply a miss), and it may well be mounted after the daemon starts, so the only check left is that each path is absolute -- a relative one would be symlinked into the snapshot dir and dangle. Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>