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* fix(volume): don't panic on read when needle map is nil A failed CommitCompact reload (and #9335's new error path for a remote-tiered volume with a stray .vif but no .idx) leaves v.nm == nil on a volume that's still in the store. readNeedle / readNeedleDataInto dereferenced v.nm with no guard, so the next GET segfaulted the http handler instead of returning an error the client could retry on another replica. Add the same v.nm == nil check the other Volume accessors already use, including the slow-read inner loop where the lock is released between iterations and a failed reload can race in. Fixes #9339. * match rust nm-nil read behavior; trim comments seaweed-volume's read_needle_with_option / re_lookup_needle_data_offset already lift Option<NeedleMap> through ok_or(NotFound). Use ErrorNotFound on the Go side too instead of a generic 500-mapped error so both volume servers respond identically when v.nm is nil. * log once when reads hit nil needle map ErrorNotFound alone hides the real cause: a half-loaded volume just returns 404s and the operator has nothing to grep for. Add a once-per- volume Errorf on the nil path, reset on successful load. Mirror the same in seaweed-volume via nm_or_not_found(). * trim comments * drop once-flag, log inline on every nil-nm read