Update server-everything to allow choosing the transport on the command line.

# Run the default (stdio) server
```npx @modelcontextprotocol/server-everything```

# Or specify stdio explicitly
```npx @modelcontextprotocol/server-everything stdio```

# Run the SSE server
```npx @modelcontextprotocol/server-everything sse```

# Run the streamable HTTP server
```npx @modelcontextprotocol/server-everything streamableHttp```

* In src/everything/index.ts
  - refactor/extracted contents to stdio.ts
  - replaced with code that
    - Gets the single argument from the commandline as scriptName
    - switches on scriptName
    - imports the appropriate server script or outputs usage options
  - scripts run on import

* In src/everything/stdio.ts
  - added console log "Starting default (STDIO) server..."

* In src/everything/sse.ts
  - added console log "Starting SSE server..."

* In src/everything/streamableHttp.ts
  - added console log "Starting Streamable HTTP server..."

* This fixes #1594

src/everything/stdio.ts

@@ -0,0 +1,26 @@
+#!/usr/bin/env node
+
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { createServer } from "./everything.js";
+
+console.log('Starting default (STDIO) server...');
+
+async function main() {
+  const transport = new StdioServerTransport();
+  const {server, cleanup} = createServer();
+
+  await server.connect(transport);
+
+  // Cleanup on exit
+  process.on("SIGINT", async () => {
+    await cleanup();
+    await server.close();
+    process.exit(0);
+  });
+}
+
+main().catch((error) => {
+  console.error("Server error:", error);
+  process.exit(1);
+});
+