Add CatalogPlugin scaffold and EvCompany resource (T2.0, T2.1)

Registers CatalogPlugin with the admin panel so catalog Filament
resources auto-discover, and adds the EvCompany model/migration/
factory plus its Filament resource (auto-generated slug on create).

app-modules/catalog/database/migrations/2026_08_05_135107_create_ev_companies_table.php

@@ -0,0 +1,36 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('ev_companies', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->string('mm_name');
+            $table->string('slug')->unique();
+            $table->text('description')->nullable();
+            $table->text('mm_description')->nullable();
+            $table->string('contact');
+            $table->string('address');
+            $table->string('logo')->nullable();
+            $table->boolean('is_active')->default(true);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('ev_companies');
+    }
+};