feat: Add comprehensive auto-sync functionality

✨ New Features:
- Auto-sync service with configurable intervals (15min, 30min, 1hour, 6hours, 12hours, 24hours, custom cron)
- Automatic JSON file synchronization from GitHub repositories
- Auto-download new scripts when JSON files are updated
- Auto-update existing scripts when newer versions are available
- Apprise notification service integration for sync status updates
- Comprehensive error handling and logging

🔧 Technical Implementation:
- AutoSyncService: Core scheduling and execution logic
- GitHubJsonService: Handles JSON file synchronization from GitHub
- AppriseService: Sends notifications via multiple channels (Discord, Telegram, Email, Slack, etc.)
- ScriptDownloaderService: Manages automatic script downloads and updates
- Settings API: RESTful endpoints for auto-sync configuration
- UI Integration: Settings modal with auto-sync configuration options

📋 Configuration Options:
- Enable/disable auto-sync functionality
- Flexible scheduling (predefined intervals or custom cron expressions)
- Selective script processing (new downloads, updates, or both)
- Notification settings with multiple Apprise URL support
- Environment-based configuration with .env file persistence

🎯 Benefits:
- Keeps script repository automatically synchronized
- Reduces manual maintenance overhead
- Provides real-time notifications of sync status
- Supports multiple notification channels
- Configurable to match different deployment needs

This feature significantly enhances the automation capabilities of PVE Scripts Local,
making it a truly hands-off solution for script management.

server.js

@@ -8,6 +8,11 @@ import stripAnsi from 'strip-ansi';
 import { spawn as ptySpawn } from 'node-pty';
 import { getSSHExecutionService } from './src/server/ssh-execution-service.js';
 import { getDatabase } from './src/server/database-prisma.js';
+import { initializeAutoSync, setupGracefulShutdown } from './src/server/lib/autoSyncInit.js';
+import dotenv from 'dotenv';
+
+// Load environment variables from .env file
+dotenv.config();
 // Fallback minimal global error handlers for Node runtime (avoid TS import)
 function registerGlobalErrorHandlers() {
   if (registerGlobalErrorHandlers._registered) return;
@@ -976,5 +981,11 @@ app.prepare().then(() => {
     .listen(port, hostname, () => {
       console.log(`> Ready on http://${hostname}:${port}`);
       console.log(`> WebSocket server running on ws://${hostname}:${port}/ws/script-execution`);
+      
+      // Initialize auto-sync service
+      initializeAutoSync();
+      
+      // Setup graceful shutdown handlers
+      setupGracefulShutdown();
     });
 });