Delete dead RecurringTicketModel::updateAfterRun() (#90)

Zero callers anywhere in the codebase — superseded by claimForRun(),
which the cron script actually uses and which additionally guards
against the double-fire race between concurrent cron invocations that
this method lacked. Removing it so a future reuse doesn't silently
reintroduce that race.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MGDKHiU5RJdo3dqQUDow3X

models/RecurringTicketModel.php

@@ -189,30 +189,6 @@ class RecurringTicketModel
         return $claimed;
     }
 
-    /**
-     * Update last run and calculate next run time
-     */
-    public function updateAfterRun($recurringId)
-    {
-        $recurring = $this->getById($recurringId);
-        if (!$recurring) {
-            return false;
-        }
-
-        $nextRun = $this->calculateNextRunTime(
-            $recurring['schedule_type'],
-            $recurring['schedule_day'],
-            $recurring['schedule_time']
-        );
-
-        $sql = "UPDATE recurring_tickets SET last_run_at = NOW(), next_run_at = ? WHERE recurring_id = ?";
-        $stmt = $this->conn->prepare($sql);
-        $stmt->bind_param('si', $nextRun, $recurringId);
-        $success = $stmt->execute();
-        $stmt->close();
-        return $success;
-    }
-
     /**
      * Calculate the next run time based on schedule
      */