MCP Connect has unauthenticated remote OS command execution via /bridge endpoint
### Summary When _AUTH_TOKEN_ and _ACCESS_TOKEN_ environment variables are not set (which is the default out-of-the-box configuration) the _/bridge_ HTTP endpoint is completely unauthenticated. Any network-accessible caller can POST a request with an attacker-controlled serverPath and args payload, causing the server to spawn an arbitrary OS process as the user running mcp-bridge. This results in full remote code execution on the host without any credentials. ### Details **Root cause 1 - Authentication not enforced when token is absent** _src/config/config.ts_ line 161 sets authToken to an empty string when neither environment variable is co