feat(api): add AI text-to-deck generation, wallet deposit structure, and profile/notification endpoints

Fills the gaps between the admin panel screens and the backend: a full
free-text + slide-count + language -> AI-generated presentation flow with
new slide-cloning logic in TemplateFillService, a "my presentations" list
endpoint, a swappable payment-gateway structure for wallet top-ups (fake
driver for now), and avatar upload / public-profile toggle / account
deletion / password change / notification preference endpoints.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/Models/WalletDeposit.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\WalletDepositStatus;
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+#[Fillable([
+    'wallet_id',
+    'amount',
+    'status',
+    'gateway',
+    'reference_id',
+    'meta',
+])]
+class WalletDeposit extends Model
+{
+    /**
+     * @return BelongsTo<Wallet, $this>
+     */
+    public function wallet(): BelongsTo
+    {
+        return $this->belongsTo(Wallet::class);
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'amount' => 'integer',
+            'status' => WalletDepositStatus::class,
+            'meta' => 'array',
+        ];
+    }
+}