Fix Embed Edit, include src and dest, include snr

[tylerpieper]

Description

This PR addresses issues with traceroute embeds failing to edit or append when replies are received, and greatly enhances the information displayed in the route path.

Changes

• Fix Embed Edit Crash: Replaced discord.Embed.from_dict() with a much safer .copy() method when duplicating the original embed. This prevents TypeError crashes that were occurring during payload conversions. Additionally, catching a generic Exception ensures the bot will always gracefully fall back to posting a new message if the edit fails for any reason.
• Include Source and Destination in Route: The RouteDiscovery payload only tracks intermediary nodes. Added logic to correctly prepend the origin and append the destination to the traceroute path so the full route is visible.
• Include SNR in Route Display: Extracted the snr_towards array from the RouteDiscovery payload. If the SNR data matches the forward path, the route is now formatted to show the signal-to-noise ratio at each hop (e.g., NOD1 --(-2.5)→ NOD2 --(3.2)→ NOD3).

Testing

• Verify that traceroute replies successfully edit existing message embeds or post new ones.
• Verify that the source and destination are properly appended to the displayed path.
• Verify that the SNR parses successfully when provided by the node hardware.