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>

.claude/memory/deploy-automation.md

@@ -0,0 +1,18 @@
+---
+name: deploy-automation-todos
+description: Items to incorporate into the deploy script for automated setup — Claude API key, AIUI nginx config, swap
+type: project
+---
+
+## Deploy Script Automation TODOs
+
+These items should be added to `scripts/deploy-to-target.sh` so new server deploys are self-contained:
+
+1. **Claude API key setup**: After deploying the proxy, auto-configure `/opt/archipelago/claude-proxy/.env.local` with the `ANTHROPIC_API_KEY`. On non-primary servers, use the standard API key (not OAuth). The key is: `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`
+
+2. **AIUI nginx location block**: Ensure nginx config includes a proper `/aiui/` location block so static JS/CSS files are served with correct MIME types. Without this, AIUI fails to load modules.
+
+3. **Swap space**: Deploy script should check for swap and create 4GB if missing (`fallocate -l 4G /swapfile && mkswap && swapon + fstab entry`).
+
+4. **Primary server (192.168.1.228)**: 4GB swap configured on 2026-03-11.
+5. **Second server (archipelago-2)**: 4GB swap configured on 2026-03-11.