refactor: remove hardcoded credentials from config

- Strip configuration.local.php to logger-only defaults
- Remove db, solr, session, checkfile_url, worker IDs (unused legacy)
- Clean credential comments from logger config files
- Add .env.example template
- Add .env to .gitignore

config/configuration.logger.quiet.php

@@ -0,0 +1,13 @@
+<?php
+use Bsr\Utils\Logger\Logger;
+
+/**
+ * Logger configuration - quiet verbosity
+ */
+return array(
+        'log' => array(
+            'file' => realpath(dirname(__FILE__) . '/..') . '/log/log.txt',
+            'format' => '%ip% - [%date%] - %status% %error% - %time% - %func%',
+            'verbosity' => Logger::QUIET,
+        ),
+    );