feat(backup): add Restic S3 backup recipes

Introduce comprehensive recipes for Restic-based S3 backups.
Covers installation, S3 repository configuration, automated backup job creation, and restoration of files.

recipes/backup/01_install-restic.md

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+# Install Restic
+
+This recipe installs Restic, a fast, secure, and encrypted backup tool.
+
+## Install Package
+
+```bash
+sudo apt update
+sudo apt install -y restic
+```
+
+## Verify Installation
+
+```bash
+restic version
+```
+
+Expected output:
+
+```text
+restic x.x.x compiled with go...
+```
+
+## Verify Binary Location
+
+```bash
+which restic
+```
+
+Expected output:
+
+```text
+/usr/bin/restic
+```
+
+## Troubleshooting
+
+### Command not found
+
+Verify that the package is installed.
+
+```bash
+dpkg -l | grep restic
+```
+
+If it is not installed, repeat the installation step.