fix(ecstore): remove reachable panics in tiering, replication, and heal paths (#4205)

* fix(ecstore): remove reachable panics in tiering, replication, and heal paths

- Parse x-amz-expiration leniently in tier PUT responses; any lifecycle
  rule on the remote tier bucket returns an RFC1123 date that the previous
  ISO8601 unwrap turned into a panic of the ILM transition worker
- Skip invalid user-metadata header values (with a warning) when building
  tier and replication PUT headers instead of panicking on non-ASCII input
- Heal: tolerate absent data_dir for delete markers and remote objects
- transition_object: don't unwrap version_id on unversioned buckets when
  recording partial writes for offline disks
- Admin server info: use port_or_known_default() so default-port (80/443)
  endpoints don't panic is_server_resolvable
- Tier ListObjectsV2 client: decode response body with from_utf8_lossy
- walk_internal: log merge_entry_channels errors instead of dropping them

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(ecstore): fail heal explicitly when data_dir is missing

Address review feedback: unwrap_or_default() silently substituted a nil
UUID when latest metadata lacked data_dir. Delete markers and remote
objects legitimately have no data_dir and skip the data-heal block, but
for a regular object a missing data_dir means corrupt metadata — return
FileCorrupt with a descriptive log instead of building part paths under
a nil UUID directory.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

crates/ecstore/src/client/api_put_object.rs

@@ -234,13 +234,17 @@ impl PutObjectOptions {
         }
 
         for (k, v) in &self.user_metadata {
+            let Ok(header_value) = HeaderValue::from_str(v) else {
+                warn!("skipping user metadata header with invalid value: {}", k);
+                continue;
+            };
             if is_amz_header(k) || is_standard_header(k) || is_storageclass_header(k) || is_rustfs_header(k) || is_minio_header(k)
             {
                 if let Ok(header_name) = HeaderName::from_bytes(k.as_bytes()) {
-                    header.insert(header_name, HeaderValue::from_str(&v).expect("operation should succeed"));
+                    header.insert(header_name, header_value);
                 }
             } else if let Ok(header_name) = HeaderName::from_bytes(format!("x-amz-meta-{}", k).as_bytes()) {
-                header.insert(header_name, HeaderValue::from_str(&v).expect("operation should succeed"));
+                header.insert(header_name, header_value);
             }
         }