v2.0.0

Changelog

• 25fa9c1 Audit fixes, CI enhancement, and docs alignment
• ed87251 Fix UpdateSettings config race and golangci-lint action version
• 6a0aa23 Fix cross-platform build and golangci-lint pipeline
• cc2dfad Fix data races in Manager lifecycle and Client state
• 25de380 Fix remaining data races: Watcher state and frp shutdown
• 583ae7e Initial commit: SyncMedia v2.0
• a14fad0 Upgrade frp to v0.70.1 and fix Restart race condition