Implement ComfyUI Manager database sync

[Revmagi]

Build system to sync custom nodes from ComfyUI Manager's official database.

Tasks

• Implement ComfyUI Manager API client
• Build node database parsing system
• Add GitHub repository analysis
• Implement requirements.txt detection
• Build sync job management system
• Add automated scheduling

Acceptance Criteria

• ComfyUI Manager database syncs successfully
• Node metadata imports correctly
• GitHub analysis works for all repositories
• Dependency detection functioning
• Sync jobs can be monitored and managed