Channel & Webhook Integrations

[skylessdev]

Scope

• Set up #issues-feed channel to receive GitHub webhooks for both vpnlnetwork/vpnl and vpnl-website repositories.
• (Optional) Implement an #onchain-feed channel that posts notable registry events via an RPC listener when on-chain events are emitted.

Acceptance Criteria

• New issues and pull requests from the repositories appear in #issues-feed.
• On-chain events (at least on testnet) appear in #onchain-feed with transaction links (optional).