fix(deploy): Backup and restore .ssh keys during git-based deployments

SSH keys for mail server management are not in git, need to preserve
them like .envs secrets.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

deploy.sh

@@ -83,6 +83,16 @@ elif [ -d "$REMOTE_DIR/.envs" ]; then
     cp -r "$REMOTE_DIR/.envs" /tmp/.envs-backup
 fi
 
+# Backup .ssh if it exists (SSH keys not in git)
+if [ -d "$REMOTE_DIR/smoothschedule/.ssh" ]; then
+    echo ">>> Backing up .ssh keys..."
+    cp -r "$REMOTE_DIR/smoothschedule/.ssh" /tmp/.ssh-backup
+elif [ -d "$REMOTE_DIR/.ssh" ]; then
+    # Old structure
+    echo ">>> Backing up .ssh keys (old location)..."
+    cp -r "$REMOTE_DIR/.ssh" /tmp/.ssh-backup
+fi
+
 if [ ! -d "$REMOTE_DIR/.git" ]; then
     echo ">>> Cloning repository for the first time..."
     # Remove old non-git deployment if exists
@@ -106,6 +116,13 @@ if [ -d /tmp/.envs-backup ]; then
     rm -rf /tmp/.envs-backup
 fi
 
+# Restore .ssh keys
+if [ -d /tmp/.ssh-backup ]; then
+    echo ">>> Restoring .ssh keys..."
+    cp -r /tmp/.ssh-backup "$REMOTE_DIR/smoothschedule/.ssh"
+    rm -rf /tmp/.ssh-backup
+fi
+
 echo ">>> Current commit:"
 git log -1 --oneline