feat: add Weeztix OAuth, coupon codes, and Mailwizz mapping

Implement Weeztix integration per documentation: database config and
subscriber coupon_code, OAuth redirect/callback, admin setup UI with
company/coupon selection via AJAX, synchronous coupon creation on public
subscribe with duplicate and rate-limit handling, Mailwizz field mapping
for coupon codes, subscriber table and CSV export, and connection hint
on the pages list.

Made-with: Cursor

database/migrations/2026_04_04_230000_create_weeztix_configs_table.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+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('weeztix_configs', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('preregistration_page_id')->constrained()->cascadeOnDelete();
+
+            $table->text('client_id');
+            $table->text('client_secret');
+            $table->string('redirect_uri');
+
+            $table->text('access_token')->nullable();
+            $table->text('refresh_token')->nullable();
+            $table->timestamp('token_expires_at')->nullable();
+            $table->timestamp('refresh_token_expires_at')->nullable();
+
+            $table->string('company_guid')->nullable();
+            $table->string('company_name')->nullable();
+
+            $table->string('coupon_guid')->nullable();
+            $table->string('coupon_name')->nullable();
+
+            $table->string('code_prefix')->default('PREREG');
+            $table->integer('usage_count')->default(1);
+
+            $table->boolean('is_connected')->default(false);
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('weeztix_configs');
+    }
+};

database/migrations/2026_04_04_230001_add_coupon_code_to_subscribers_table.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+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::table('subscribers', function (Blueprint $table) {
+            $table->string('coupon_code')->nullable()->after('synced_at');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('subscribers', function (Blueprint $table) {
+            $table->dropColumn('coupon_code');
+        });
+    }
+};

database/migrations/2026_04_04_230002_add_field_coupon_code_to_mailwizz_configs_table.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+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::table('mailwizz_configs', function (Blueprint $table) {
+            $table->string('field_coupon_code')->nullable()->after('field_phone');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('mailwizz_configs', function (Blueprint $table) {
+            $table->dropColumn('field_coupon_code');
+        });
+    }
+};