Fix command-line argument passing to pre-fill UI

When running the inspector with command-line arguments (e.g.,
`npx @modelcontextprotocol/inspector node build/index.js arg1 arg2`),
the command and arguments were not being properly passed through to
the UI for pre-filling.

Changes:
- cli.ts now passes command and args to start.js
- start.js uses --command for the command and --args for arguments
- Server parses the new --command parameter
- /config endpoint returns correct values for UI pre-filling

This ensures the UI correctly displays the command and arguments
passed on the command line instead of showing old localStorage values.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

client/bin/start.js

@@ -91,8 +91,10 @@ async function startProdServer(serverOptions) {
     "node",
     [
       inspectorServerPath,
-      ...(command ? [`--env`, command] : []),
-      ...(mcpServerArgs ? [`--args=${mcpServerArgs.join(" ")}`] : []),
+      ...(command ? [`--command`, command] : []),
+      ...(mcpServerArgs && mcpServerArgs.length > 0
+        ? [`--args`, mcpServerArgs.join(" ")]
+        : []),
     ],
     {
       env: {