refactor: update dependencies and remove unused code

- Added new dependencies: `adler2`, `crc32fast`, `flate2`, `miniz_oxide`, and `libredox`.
- Updated existing dependencies: `tokio-rustls` to version 0.26.4 and `filetime` to version 0.2.27.
- Removed the `backup.rs` file as it is no longer needed.
- Introduced tests for configuration and credential management.
- Enhanced the `identity` module to generate W3C compliant DID documents.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/archipelago/src/electrs_status.rs

@@ -161,7 +161,7 @@ pub async fn get_electrs_sync_status() -> ElectrsSyncStatus {
             let err_msg = e.to_string();
             let (status, error) = if err_msg.contains("connect") || err_msg.contains("Connection refused") {
                 // Estimate progress from data directory size
-                let est_pct = if data_bytes > 0 {
+                let _est_pct = if data_bytes > 0 {
                     ((data_bytes as f64 / ESTIMATED_FULL_INDEX_BYTES) * 100.0).min(99.0)
                 } else {
                     0.0