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/Notification.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\NotificationType;
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+#[Fillable(['user_id', 'type', 'title', 'body', 'data', 'read_at'])]
+class Notification extends Model
+{
+    /**
+     * @return BelongsTo<User, $this>
+     */
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function isRead(): bool
+    {
+        return $this->read_at !== null;
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'type' => NotificationType::class,
+            'data' => 'array',
+            'read_at' => 'datetime',
+        ];
+    }
+}