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/User.php

@@ -17,7 +17,7 @@ use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Laravel\Sanctum\HasApiTokens;
 
-#[Fillable(['name', 'username', 'email', 'mobile', 'password'])]
+#[Fillable(['name', 'username', 'email', 'mobile', 'password', 'avatar_path', 'is_public'])]
 #[Hidden(['password', 'remember_token'])]
 class User extends Authenticatable implements FilamentUser
 {
@@ -56,6 +56,22 @@ class User extends Authenticatable implements FilamentUser
         return $this->hasMany(Notification::class)->latest();
     }
 
+    /**
+     * @return HasOne<NotificationPreference, $this>
+     */
+    public function notificationPreference(): HasOne
+    {
+        return $this->hasOne(NotificationPreference::class);
+    }
+
+    /**
+     * @return HasMany<TemplateGeneration, $this>
+     */
+    public function templateGenerations(): HasMany
+    {
+        return $this->hasMany(TemplateGeneration::class, 'requested_by')->latest();
+    }
+
     public function hasRole(string|array $roles): bool
     {
         $roles = (array) $roles;
@@ -87,6 +103,7 @@ class User extends Authenticatable implements FilamentUser
         return [
             'email_verified_at' => 'datetime',
             'password' => 'hashed',
+            'is_public' => 'boolean',
         ];
     }
 }