fix(security): block ORDER BY SQL injection via orderByField (GHSA-cp8p) (#670)

v3 port. orderByField/orderBy were passed straight into Eloquent's orderBy()
in every model's scopeWhereOrder (and Invoice::scopeApplyFilters), allowing
arbitrary SQL in the ORDER BY clause.

Adds App\Support\SafeOrderBy::apply() (plain/table-qualified column identifier
only, asc/desc clamp) and routes all 10 model sort sinks through it. Aliased
sorts (e.g. estimates by customers.name) stay valid.

Adds unit tests for injection rejection, plain + aliased columns, direction clamp.

app/Models/RecurringInvoice.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use App\Support\SafeOrderBy;
 use App\Traits\HasCustomFieldsTrait;
 use Carbon\Carbon;
 use Cron;
@@ -129,7 +130,7 @@ class RecurringInvoice extends Model
 
     public function scopeWhereOrder($query, $orderByField, $orderBy)
     {
-        $query->orderBy($orderByField, $orderBy);
+        SafeOrderBy::apply($query, $orderByField, $orderBy);
     }
 
     public function scopeWhereStatus($query, $status)