fix: remove public key deployment from deploy-keys

Deploy-keys now only:
- Creates /var/lib/syncserver/ssh/keys on remote
- Uploads private keys of all other machines to that path
- Populates known_hosts with all other machine hosts

No longer touches authorized_keys or reads server public key.

internal/sshmanager/deploy.go

@@ -8,7 +8,6 @@ import (
 	"net"
 	"os"
 	"path/filepath"
-	"strings"
 	"time"
 
 	"golang.org/x/crypto/ssh"
@@ -26,7 +25,7 @@ type DeployResult struct {
 	Errors   []string
 }
 
-func DeployKeysToMachine(ctx context.Context, serverKeyPath, serverPubKey string, host string, port int, user string, keys []DeployKey, knownHostsHosts []string, addServerPubKey bool) (*DeployResult, error) {
+func DeployKeysToMachine(ctx context.Context, serverKeyPath string, host string, port int, user string, keys []DeployKey, knownHostsHosts []string) (*DeployResult, error) {
 	result := &DeployResult{Success: true, Messages: []string{}, Errors: []string{}}
 
 	addr := fmt.Sprintf("%s:%d", host, port)
@@ -163,27 +162,6 @@ func DeployKeysToMachine(ctx context.Context, serverKeyPath, serverPubKey string
 		}
 	}
 
-		if addServerPubKey && serverPubKey != "" {
-		session3, err := conn.NewSession()
-		if err != nil {
-			result.Errors = append(result.Errors, fmt.Sprintf("session for authorized_keys: %v", err))
-			result.Success = false
-		} else {
-			session3.Stdout = &stdout
-			session3.Stderr = &stderr
-			pubKeyClean := strings.TrimSpace(serverPubKey)
-			err := session3.Run(fmt.Sprintf("mkdir -p ~/.ssh && chmod 700 ~/.ssh && echo '%s' >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys", pubKeyClean))
-			session3.Close()
-			if err != nil {
-				slog.Warn("deploy: adding to authorized_keys failed", "host", host, "error", err)
-				result.Errors = append(result.Errors, fmt.Sprintf("adding to authorized_keys: %v (stderr: %s)", err, stderr.String()))
-				result.Success = false
-			} else {
-				result.Messages = append(result.Messages, fmt.Sprintf("Added server public key to %s@%s:~/.ssh/authorized_keys", user, host))
-			}
-		}
-	}
-
 	slog.Info("deploy keys result", "host", host, "success", result.Success, "messages", len(result.Messages), "errors", len(result.Errors))
 	return result, nil
 }