refactor(storage-server): add SectorId, FileName, PackedPath newtypes, eliminate raw primitives and DRY violations

crates/servers/storage-server/src/tests/protocol.rs

@@ -4,7 +4,8 @@ use server_framework::{Decode, Encode};
 
 #[test]
 fn open_roundtrip() {
-    let req = StorageRequest::Open { path_word0: 0x61626364, path_word1: 0 };
+    let path = PackedPath::from_bytes(b"test.txt");
+    let req = StorageRequest::Open { path };
     assert_eq!(StorageRequest::decode(req.encode()), Some(req));
 }
 
@@ -62,3 +63,11 @@ fn all_response_variants() {
 fn invalid_request_returns_none() {
     assert!(StorageRequest::decode([99, 0, 0, 0]).is_none());
 }
+
+#[test]
+fn packed_path_roundtrip() {
+    let path = PackedPath::from_bytes(b"hello");
+    let buf = path.to_bytes();
+    assert_eq!(&buf[..5], b"hello");
+    assert_eq!(buf[5], 0);
+}