Add GitHub Sync - Automated repository synchronization tool

Complete implementation of automated GitHub repository synchronization:
- Webhook-based auto-sync from GitHub
- Multi-repository support with branch selection
- Web dashboard for management
- Manual sync and rollback functionality
- Comprehensive logging and monitoring

Located in /gitpusher/ subdirectory as standalone application.

gitpusher/src/Logger.php

@@ -0,0 +1,166 @@
+<?php
+/**
+ * Logger - Manages log entries for sync operations
+ */
+class Logger {
+    private $configManager;
+    private $maxLogEntries = 1000; // Keep last 1000 entries
+
+    public function __construct(ConfigManager $configManager) {
+        $this->configManager = $configManager;
+    }
+
+    /**
+     * Add log entry
+     */
+    public function log($repoId, $type, $message, $details = []) {
+        $logs = $this->configManager->read('log.json');
+
+        if (!isset($logs['entries'])) {
+            $logs['entries'] = [];
+        }
+
+        $entry = [
+            'id' => uniqid('log_', true),
+            'timestamp' => date('Y-m-d H:i:s'),
+            'repo_id' => $repoId,
+            'type' => $type, // success, error, warning, info
+            'message' => $message,
+            'details' => $details
+        ];
+
+        // Add to beginning of array
+        array_unshift($logs['entries'], $entry);
+
+        // Keep only last N entries
+        if (count($logs['entries']) > $this->maxLogEntries) {
+            $logs['entries'] = array_slice($logs['entries'], 0, $this->maxLogEntries);
+        }
+
+        $this->configManager->write('log.json', $logs);
+
+        // Also log to PHP error log for debugging
+        error_log("[GitPusher] [$type] $repoId: $message");
+
+        return $entry['id'];
+    }
+
+    /**
+     * Log success
+     */
+    public function success($repoId, $message, $details = []) {
+        return $this->log($repoId, 'success', $message, $details);
+    }
+
+    /**
+     * Log error
+     */
+    public function error($repoId, $message, $details = []) {
+        return $this->log($repoId, 'error', $message, $details);
+    }
+
+    /**
+     * Log warning
+     */
+    public function warning($repoId, $message, $details = []) {
+        return $this->log($repoId, 'warning', $message, $details);
+    }
+
+    /**
+     * Log info
+     */
+    public function info($repoId, $message, $details = []) {
+        return $this->log($repoId, 'info', $message, $details);
+    }
+
+    /**
+     * Get all log entries
+     */
+    public function getAll($limit = 100, $offset = 0) {
+        $logs = $this->configManager->read('log.json');
+        $entries = $logs['entries'] ?? [];
+
+        return array_slice($entries, $offset, $limit);
+    }
+
+    /**
+     * Get logs for specific repository
+     */
+    public function getByRepository($repoId, $limit = 100) {
+        $logs = $this->configManager->read('log.json');
+        $entries = $logs['entries'] ?? [];
+
+        $filtered = array_filter($entries, function($entry) use ($repoId) {
+            return $entry['repo_id'] === $repoId;
+        });
+
+        return array_slice(array_values($filtered), 0, $limit);
+    }
+
+    /**
+     * Get logs by type
+     */
+    public function getByType($type, $limit = 100) {
+        $logs = $this->configManager->read('log.json');
+        $entries = $logs['entries'] ?? [];
+
+        $filtered = array_filter($entries, function($entry) use ($type) {
+            return $entry['type'] === $type;
+        });
+
+        return array_slice(array_values($filtered), 0, $limit);
+    }
+
+    /**
+     * Clear all logs
+     */
+    public function clear() {
+        return $this->configManager->write('log.json', ['entries' => []]);
+    }
+
+    /**
+     * Clear logs for specific repository
+     */
+    public function clearByRepository($repoId) {
+        $logs = $this->configManager->read('log.json');
+        $entries = $logs['entries'] ?? [];
+
+        $filtered = array_filter($entries, function($entry) use ($repoId) {
+            return $entry['repo_id'] !== $repoId;
+        });
+
+        $logs['entries'] = array_values($filtered);
+
+        return $this->configManager->write('log.json', $logs);
+    }
+
+    /**
+     * Get statistics
+     */
+    public function getStats() {
+        $logs = $this->configManager->read('log.json');
+        $entries = $logs['entries'] ?? [];
+
+        $stats = [
+            'total' => count($entries),
+            'success' => 0,
+            'error' => 0,
+            'warning' => 0,
+            'info' => 0,
+            'last_24h' => 0
+        ];
+
+        $yesterday = strtotime('-24 hours');
+
+        foreach ($entries as $entry) {
+            $stats[$entry['type']]++;
+
+            $timestamp = strtotime($entry['timestamp']);
+            if ($timestamp >= $yesterday) {
+                $stats['last_24h']++;
+            }
+        }
+
+        return $stats;
+    }
+}