Forces synchronization of policies to Redis cache and Core API.

Synchronization Modes:

1. Synchronous Mode (async=false, default):

   • Waits for synchronization to complete
   • Returns HTTP 200 OK with detailed results
   • Response includes: synchronizedCount, failedCount, status, message
   • Supports clearCache parameter
   • Recommended for: Admin operations, testing, troubleshooting

2. Asynchronous Mode (async=true):

   • Returns immediately with HTTP 202 ACCEPTED
   • Synchronization happens in background
   • Response includes: status=INITIATED, timestamp, estimatedCompletion
   • Recommended for: UI operations, bulk updates, non-blocking workflows

Use Cases:
• After bulk policy updates
• Before critical operations requiring latest policies
• Troubleshooting policy inconsistencies
• Emergency policy rollout
• Scheduled maintenance operations