feature: update worker to use libp2p node

[noot]

• implement worker libp2p node with handling of required request-response message types
• update worker to use libp2p node when started
• remove iroh from worker

[Copilot]

Pull Request Overview

This PR replaces the custom Iroh-based P2P implementation in the worker with a new libp2p-backed p2p::Node, persists and loads the node keypair in SystemState, and removes obsolete seed-based utilities.

• Persist/load libp2p keypair instead of seeding Iroh and generating IDs
• Wire new crate::p2p::Service into CLI and heartbeat logic
• Remove old iroh dependencies and utility functions

Reviewed Changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
crates/worker/src/utils/p2p.rs	Deleted obsolete Iroh-based seed/id utilities
crates/worker/src/state/system_state.rs	Persist/load p2p::Keypair instead of seeds/IDs
crates/worker/src/p2p/mod.rs	New Service using external p2p crate
crates/worker/src/cli/command.rs	Updated CLI to build new libp2p service
crates/worker/src/operations/heartbeat/service.rs	Updated heartbeat to use PeerId
crates/worker/src/operations/compute_node.rs	Adjusted pool ID types and logging
crates/worker/src/docker/**/*.rs	Removed P2P seed substitutions in task bridge
crates/worker/Cargo.toml	Added p2p workspace dependency
crates/p2p/src/lib.rs	Exposed Keypair alias for external crate

Comments suppressed due to low confidence (2)

crates/worker/src/p2p/mod.rs:34

• [nitpick] There are no unit or integration tests for the new Service::new and message-handling flows. Adding basic tests (e.g., instantiating a Service, sending a mock request, verifying the response) would help ensure correctness.

    pub(crate) fn new(

crates/worker/src/p2p/mod.rs:126

• [nitpick] The name Context is very general and may clash with other contexts. Consider renaming it to something more specific like ServiceContext or P2pContext for clarity.

struct Context {

[noot]

closing in favour of #622