Resolve backend Qodana critical and high findings (#314)

Resolve recommended-profile Critical and High findings, retain narrow analyzer exceptions, and update the edge-broker WebSocket dependency to a non-vulnerable release.

services/nginx/app/traits/route_t.php

@@ -55,7 +55,6 @@ trait route_t
         } catch (Exception $e) {
             $response->error($e->getMessage(), 400);
         }
-        return false;
     }
 
     /**
@@ -468,7 +467,6 @@ trait route_t
             return $allowed;
         } catch (Exception $e) {
             $response->error($e->getMessage(), 400);
-            return false;
         }
     }