reconnect with backoff

[turuslan]

• reconnect when not enough peers
• exponential backoff on disconnect and failed connect
• reset backoff on successful connect

[Copilot]

Pull request overview

This PR implements an automatic peer reconnection mechanism with exponential backoff to maintain stable network connectivity. The system now actively monitors peer connections and attempts to reconnect when peer counts drop below desired thresholds.

Key changes:

• Adds state machine for peer lifecycle management (Connectable → Connecting → Connected → Backoff)
• Implements exponential backoff strategy for failed connections with configurable min/max durations
• Introduces periodic connection maintenance via 5-second timer loop

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
src/modules/networking/networking.hpp	Defines PeerState struct with variant states, adds peer tracking members (peer_states_, connectable_peers_, random_), and declares connectToPeers() method
src/modules/networking/networking.cpp	Implements connectToPeers() with backoff logic, updates bootnode initialization to populate peer states, adds backoff handling in disconnect handler, and establishes timer loop for periodic connection attempts

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[kamilsa]

Add more documentation to new methods and structures