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/release-process.md

@@ -0,0 +1,111 @@
+# Archipelago Release Process
+
+## Overview
+
+Archipelago uses a JSON-based release manifest for the auto-update system. The backend checks `UPDATE_MANIFEST_URL` periodically (based on user's schedule setting) and compares versions.
+
+## Manifest Format
+
+The manifest is a single JSON file at:
+```
+https://raw.githubusercontent.com/archipelago-os/releases/main/manifest.json
+```
+
+```json
+{
+  "version": "0.2.0",
+  "release_date": "2026-04-01",
+  "changelog": [
+    "Added automatic update scheduling",
+    "Improved backup encryption"
+  ],
+  "components": [
+    {
+      "name": "archipelago",
+      "current_version": "0.1.0",
+      "new_version": "0.2.0",
+      "download_url": "https://github.com/archipelago-os/releases/releases/download/v0.2.0/archipelago",
+      "sha256": "abc123...",
+      "size_bytes": 15000000
+    }
+  ]
+}
+```
+
+## Release Steps
+
+### 1. Build Release Artifacts
+
+On the build server (192.168.1.228):
+
+```bash
+# Build backend (release mode)
+cd ~/archy/core
+cargo build --release -p archipelago
+
+# Build frontend
+cd ~/archy/neode-ui
+npm run build
+```
+
+### 2. Generate Manifest
+
+```bash
+./scripts/create-release-manifest.sh \
+  --version 0.2.0 \
+  --date 2026-04-01
+```
+
+This auto-detects the backend binary and frontend archive, computes SHA256 hashes, and writes `manifest.json`.
+
+### 3. Upload Artifacts
+
+Upload the backend binary and frontend archive to GitHub Releases:
+
+```bash
+gh release create v0.2.0 \
+  core/target/release/archipelago \
+  /tmp/archipelago-frontend-0.2.0.tar.gz \
+  --title "v0.2.0" \
+  --notes "See CHANGELOG.md for details"
+```
+
+### 4. Publish Manifest
+
+Push the generated `manifest.json` to the releases repo:
+
+```bash
+# In the archipelago-os/releases repo
+cp manifest.json .
+git add manifest.json
+git commit -m "Release v0.2.0"
+git push
+```
+
+### 5. Tag the Source
+
+```bash
+git tag v0.2.0
+git push --tags
+```
+
+## Update Schedules
+
+Users can configure how updates are handled:
+
+| Schedule | Behavior |
+|----------|----------|
+| **Manual** | Never checks automatically. User must click "Check for Updates" |
+| **Daily Check** (default) | Checks once per day. Notifies user, who decides when to install |
+| **Auto-Apply** | Checks daily. Downloads and applies at 3 AM, restarts service |
+
+## Rollback
+
+If an update causes issues, users can rollback from the System Update page. The previous binary is backed up to `{data_dir}/update-backup/` before applying.
+
+## Security
+
+- All downloads are verified against SHA256 hashes in the manifest
+- The manifest itself is fetched over HTTPS from a known URL
+- Binary replacement requires service restart (handled by systemd)
+- Rollback is always available after an update