feat: agent token, auth.agent middleware, /mcp route with HadoServer skeleton

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BCrwHHnGCB5XH968Nxokqw

core/database/migrations/2026_09_05_000000_create_agent_tokens.php

@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        // Токен агента (MCP): один на пользователя, строка есть — токен есть.
+        Schema::create('agent_tokens', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->unique()->constrained()->cascadeOnDelete();
+            $table->string('token_hash', 64)->unique();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('agent_tokens');
+    }
+};