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>

scripts/kiosk-watchdog.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# kiosk-watchdog.sh — Monitors Archipelago backend health.
+# Restarts the backend if it's unresponsive for 60 seconds.
+# Shows server IP on text console if X is not running.
+#
+# Designed to run as a systemd service or standalone.
+
+set -euo pipefail
+
+HEALTH_URL="http://localhost/health"
+CHECK_INTERVAL=5  # seconds between checks
+MAX_FAILS=12      # 12 x 5s = 60s before restart
+
+FAIL_COUNT=0
+
+echo "Archipelago kiosk watchdog started"
+
+while true; do
+    # Check backend health
+    if curl -sf "$HEALTH_URL" > /dev/null 2>&1; then
+        if [ "$FAIL_COUNT" -gt 0 ]; then
+            echo "Backend recovered after $FAIL_COUNT failed checks"
+        fi
+        FAIL_COUNT=0
+    else
+        FAIL_COUNT=$((FAIL_COUNT + 1))
+        echo "Health check failed ($FAIL_COUNT/$MAX_FAILS)"
+
+        if [ "$FAIL_COUNT" -ge "$MAX_FAILS" ]; then
+            echo "Backend unresponsive for 60s, restarting archipelago service..."
+            systemctl restart archipelago || true
+            FAIL_COUNT=0
+            sleep 10
+            continue
+        fi
+    fi
+
+    # If X is not running, display IP on text console as fallback
+    if ! pgrep -x Xorg > /dev/null 2>&1 && ! pgrep -x chromium > /dev/null 2>&1; then
+        IP=$(hostname -I 2>/dev/null | awk '{print $1}')
+        if [ -n "$IP" ]; then
+            printf '\n\n  Archipelago Server\n  IP: %s\n  Web UI: http://%s\n\n' "$IP" "$IP" > /dev/tty1 2>/dev/null || true
+        fi
+    fi
+
+    sleep "$CHECK_INTERVAL"
+done