Add first-party Etsy MCP server for shop listings, orders and messages

Expose php artisan etsy:mcp as JSON-RPC stdio next to laravel-boost, reuse the stored HickLab3D shop connection, create listings as drafts only, and skip Etsy v3 conversation send because that API does not exist.

app/Console/Commands/EtsyMcp.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Services\EtsyMcpServer;
+use Illuminate\Console\Attributes\Description;
+use Illuminate\Console\Attributes\Signature;
+use Illuminate\Console\Command;
+use Symfony\Component\Console\Output\OutputInterface;
+
+#[Signature('etsy:mcp')]
+#[Description('Run the HickLab3D Etsy MCP server over JSON-RPC stdio')]
+class EtsyMcp extends Command
+{
+    public function handle(EtsyMcpServer $server): int
+    {
+        ini_set('display_errors', 'stderr');
+        $this->output->setDecorated(false);
+        $input = $this->input->getStream() ?? STDIN;
+
+        while (! feof($input)) {
+            $line = fgets($input);
+            if ($line === false) {
+                break;
+            }
+            $response = $server->handleLine($line);
+            if ($response !== null) {
+                $this->output->write($response.PHP_EOL, false, OutputInterface::OUTPUT_RAW);
+            }
+        }
+
+        return self::SUCCESS;
+    }
+}