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>

docs/arm64-container-images.md

@@ -0,0 +1,21 @@
+# ARM64 Container Image Compatibility
+
+All core Archipelago marketplace apps have multi-arch Docker images with ARM64 (linux/arm64) support.
+
+## Core Apps
+
+| App | Image | Tag | ARM64 | ARMv7 |
+|-----|-------|-----|-------|-------|
+| Bitcoin Knots | `bitcoinknots/bitcoin` | `latest` | Yes | Yes |
+| Electrs | `mempool/electrs` | `latest` | Yes | No |
+| BTCPay Server | `btcpayserver/btcpayserver` | `1.13.5` | Yes | Yes |
+| LND | `lightninglabs/lnd` | `v0.17.4-beta` | Yes | No |
+| Mempool | `mempool/frontend` | `v2.5.0` | Yes | Yes |
+| FileBrowser | `filebrowser/filebrowser` | `v2.27.0` | Yes | Yes |
+
+## Notes
+
+- All images use multi-arch manifest lists — Podman/Docker will automatically pull the correct architecture
+- No changes needed to `Marketplace.vue` image references — the same tags work on both x86_64 and ARM64
+- Three apps also support ARMv7 (32-bit ARM), but Archipelago targets ARM64 only
+- Verified 2026-03-11 via Docker Hub registry API manifest inspection