feat: tunnel state reporting to control plane

[Yourdaylight]

• 60s periodic full tunnel report via reverse WebSocket
• Real-time tunnel lifecycle events (created/updated/started/stopped/deleted)
• Service-layer exclusive event emission with local hook capture
• Standard webapi.Event format with idempotency support
• Fix: wrapBackgroundLoopStart async goroutine to prevent web server blocking
• Fix: snapshotTunnelForList clone MaxConn field
• Fix: use Target.TargetStr instead of deprecated TargetAddr in event payload

[gemini-code-assist]

Code Review

This pull request introduces a global management event hook mechanism to centralize tunnel resource mutation events, implements periodic full tunnel state reporting via WebSockets, and adds compatibility tests for control plane configuration parsing. It also fixes a background loop startup block and includes minor updates like tracking MaxConn in tunnel snapshots. Feedback highlights potential data races in emitTunnelEvent due to unsynchronized access to nested tunnel fields, and a potential nil pointer dereference or race condition caused by registering the global event hook before the state object is fully initialized.

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