fix(filemeta): redact sealed keys and elide inline data in FileInfo Debug (#5725)

FileInfo's derived Debug printed the full metadata map (including X-Rustfs/X-Minio-Internal-Server-Side-Encryption-Sealed-Key and -Iv values, i.e. KEK-wrapped DEK ciphertext) and the full inline data bytes (plaintext user content for non-SSE small objects), so any whole-struct log dump such as the heal_object dumps leaked user data and sealed key material into logs.

Replace the derive with a manual Debug impl that redacts encryption metadata values (keys stay visible, values print as redacted with length) under both internal prefixes, and elides data/checksum bytes to a length summary. The exhaustive destructuring forces every future field through an explicit show/redact decision. starts_with_ignore_ascii_case is made pub in rustfs-utils for reuse.

crates/utils/src/http/metadata_compat.rs

@@ -65,7 +65,7 @@ pub const SUFFIX_REPLICATION_DELETE_MARKER_VERSION_ARN_PREFIX: &str = "replicati
 /// Case-insensitive (ASCII) check that `s` begins with `prefix`. Equivalent to
 /// `s.to_lowercase().starts_with(prefix)` when `prefix` is ASCII (as both internal prefixes are),
 /// but without allocating.
-fn starts_with_ignore_ascii_case(s: &str, prefix: &str) -> bool {
+pub fn starts_with_ignore_ascii_case(s: &str, prefix: &str) -> bool {
     s.len() >= prefix.len() && s.as_bytes()[..prefix.len()].eq_ignore_ascii_case(prefix.as_bytes())
 }