feat: Add comprehensive documentation suite and reorganize project structure

- Created complete documentation in docs/ directory
- Added PROJECT_OVERVIEW.md with feature highlights and getting started guide
- Added ARCHITECTURE.md with system design and technical details
- Added SECURITY.md with comprehensive security implementation guide
- Added DEVELOPMENT.md with development workflows and best practices
- Added DEPLOYMENT.md with production deployment instructions
- Added API.md with complete REST API documentation
- Added CONTRIBUTING.md with contribution guidelines
- Added CHANGELOG.md with version history and migration notes
- Reorganized all documentation files into docs/ directory for better organization
- Updated README.md with proper documentation links and quick navigation
- Enhanced project structure with professional documentation standards

f_scripts/cleanup_logs.php

@@ -0,0 +1,22 @@
+<?php
+define('_ISVALID', true);
+include_once __DIR__ . '/../f_core/config.core.php';
+
+$days = (int) ($cfg['logging_retention_days'] ?? 30);
+if ($days <= 0) { exit(0); }
+
+$dir = 'f_data/logs/';
+$cutoff = time() - ($days * 86400);
+
+if (!is_dir($dir)) { exit(0); }
+
+$deleted = 0;
+foreach (glob($dir . '*.log*') as $file) {
+    if (@filemtime($file) < $cutoff) {
+        @unlink($file);
+        $deleted++;
+    }
+}
+
+echo "Cleanup complete, deleted {$deleted} files\n";
+