fix: Argument notation to allow parseArgs to parse leading dash-options

The server was invoked as:

`server/build/index.js --command comm --args arg1 arg2 arg3`

(`arg1 arg2 arg3` is a string in ARGV; the single value of `--args`.)

`util:parseArgs()` cannot handle an argument value with a leading dash
with this usage.

e.g.,

`server/build/index.js --command npm --args --silent --prefix path/to/servers/src/everything run start`

The above will throw, and indicate correct usage:

```
TypeError [ERR_PARSE_ARGS_INVALID_OPTION_VALUE]: Option '--args' argument is ambiguous.
Did you forget to specify the option argument for '--args'?
To specify an option argument starting with a dash use '--args=-XYZ'.
```

However, since users do not control the invocation of the server, they
cannot adjust the notation for their use-case.

`arguments`, and `command`, are unknown user input, so adjust the
argument form to the more lenient and robust notation.  Although a
`command` beginning with `-` seems unlikely, consistent handling of both
improves code clarity and simplicity.

Running the server directly (e.g., on the command line in development)
may continue to use: `--args arg1 arg2 arg3` if desired, so this is a
non-breaking change.

client/bin/start.js

@@ -91,10 +91,10 @@ async function startProdServer(serverOptions) {
     "node",
     [
       inspectorServerPath,
-      ...(command ? [`--command`, command] : []),
+      command ? `--command=${command}` : "",
-      ...(mcpServerArgs && mcpServerArgs.length > 0
+      mcpServerArgs && mcpServerArgs.length > 0
-        ? [`--args`, mcpServerArgs.join(" ")]
+        ? `--args=${mcpServerArgs.join(" ")}`
-        : []),
+        : "",
     ],
     {
       env: {