feat: product team members

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

database/migrations/2026_10_17_130000_create_product_members_table.php

@@ -0,0 +1,26 @@
+<?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
+    {
+        Schema::create('product_members', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('product_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('user_id')->constrained()->cascadeOnDelete();
+            $table->string('role', 100);
+            $table->timestamps();
+
+            $table->unique(['product_id', 'user_id']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('product_members');
+    }
+};