Updated server launch behavior to reliably treat JSON file arguments as config paths, including file-manager “Open with” cases. The CLI `serve` command now accepts an optional positional config path (equivalent to `--config`) and errors on conflicting values. `start.sh` and `start.bat` now parse config-related arguments more explicitly, validate required values, and always pass `--config` to avoid accidental positional forwarding. Added tests covering both positional and `--config` forms, plus README documentation for the new startup behavior.
