fix: unify log path to runtime/log/ for all contexts

- Logger: use root_path()/runtime/log/ instead of runtime_path()/log/
  (runtime_path() returns app-specific path in multi-app mode)
- Remove debug output from Log controller

app/utils/Logger.php

@@ -13,7 +13,7 @@ class Logger
     {
         $date = date('Y-m-d');
         $time = date('Y-m-d H:i:s');
-        $dir = runtime_path() . 'log' . DIRECTORY_SEPARATOR . $category;
+        $dir = root_path() . 'runtime' . DIRECTORY_SEPARATOR . 'log' . DIRECTORY_SEPARATOR . $category;
         if (!is_dir($dir)) {
             mkdir($dir, 0755, true);
         }