refactor(dns-cache): drop data from DnsCacheRecord

Auto-generated equals/hashCode would compare the ByteArray-list of
addresses by reference identity — a footgun no caller needs. No code
uses ==, copy, componentN, or hashing on records, so the class is now
plain with no synthesized methods.

amethyst/src/main/java/com/vitorpamplona/amethyst/service/okhttp/SurgeDns.kt

@@ -342,8 +342,12 @@ class SurgeDns(
  * Persistable record. Addresses are stored as raw bytes (4 or 16) so [SurgeDnsStore] can write
  * them straight into the binary blob and round-trip through [InetAddress.getByAddress] without
  * formatting/parsing a string literal on either side.
+ *
+ * Not a `data class`: the auto-generated `equals`/`hashCode` would compare `addresses`
+ * (List<ByteArray>) by reference identity, which is a footgun. Nothing in this codebase needs
+ * structural equality on records, so the methods are simply not provided.
  */
-data class DnsCacheRecord(
+class DnsCacheRecord(
     val hostname: String,
     val addresses: List<ByteArray>,
     val expiresAtMillis: Long,