Fix startup script: use ssh-start instead of ssh-server-start

Fixes command name in start_services.sh:
- ssh-server-start → ssh-start (correct CLI command)

Verified by running:
  cargo run --bin markbase-core -- --help | grep ssh

scripts/start_services.sh

@@ -78,7 +78,7 @@ echo "=== Starting SSH Server (Port $PORT_SSH) ==="
 if check_port $PORT_SSH; then
     echo "${YELLOW}Port $PORT_SSH already in use${NC}"
 else
-    cargo run --bin markbase-core -- ssh-server-start --port $PORT_SSH --root "$ROOT_DIR" --auth-db "$AUTH_DB" > "$LOG_DIR/ssh.log" 2>&1 &
+    cargo run --bin markbase-core -- ssh-start --port $PORT_SSH --root "$ROOT_DIR" --auth-db "$AUTH_DB" > "$LOG_DIR/ssh.log" 2>&1 &
     sleep 2
     if check_port $PORT_SSH; then
         echo "${GREEN}SSH Server started${NC}"