feat: add ApiResponse trait for standardized API responses

chore: update composer dependencies to include phppresentation

chore: update composer.lock after adding phppresentation

feat: create categories migration for category management

feat: create templates migration for template storage

feat: create template generations migration for tracking template usage

feat: create template keys migration for template customization

feat: create notifications migration for user notifications

feat: update API routes for categories, templates, and user profile management

docs: update API documentation to include new endpoints for profile and wallet

app/Models/TemplateKey.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\TemplateKeyType;
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+#[Fillable([
+    'template_id',
+    'key',
+    'label',
+    'type',
+    'shape_name',
+    'is_required',
+    'sort_order',
+    'description',
+])]
+class TemplateKey extends Model
+{
+    /**
+     * @return BelongsTo<Template, $this>
+     */
+    public function template(): BelongsTo
+    {
+        return $this->belongsTo(Template::class);
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'type' => TemplateKeyType::class,
+            'is_required' => 'boolean',
+            'sort_order' => 'integer',
+        ];
+    }
+}