Add run_until_shutdown utility for services

[malzag]

…cpp arbiter thread panicking

[Copilot]

Pull request overview

This PR introduces a shared run_until_shutdown helper to simplify service loops and standardize shutdown behavior.

Changes:

• Added run_until_shutdown utility (with tests) and exported it from paddler’s public module tree.
• Refactored several services to use run_until_shutdown instead of hand-rolled loop { tokio::select! { ... } } patterns.
• Relaxed async_trait Send requirements for the Service trait and its implementations (#[async_trait(?Send)]).

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
paddler/src/run_until_shutdown.rs	New shutdown-driven loop helper plus unit tests.
paddler/src/lib.rs	Exposes the new run_until_shutdown module.
paddler/src/service.rs	Updates Service trait to #[async_trait(?Send)].
paddler/src/service_manager.rs	Updates test Service impls to #[async_trait(?Send)].
paddler/src/balancer/statsd_service/mod.rs	Refactors periodic metrics reporting to use run_until_shutdown.
paddler/src/balancer/reconciliation_service.rs	Refactors reconciliation loop to use run_until_shutdown.
paddler/src/agent/reconciliation_service.rs	Refactors reconciliation loop to use run_until_shutdown and changes behavior on channel close to return an error.
paddler/src/agent/management_socket_client_service.rs	Refactors keep-alive loop to use run_until_shutdown.
paddler/src/agent/llamacpp_arbiter_service.rs	Refactors arbiter loop to use run_until_shutdown and uses the provided shutdown receiver for forwarded requests.
paddler/src/balancer/web_admin_panel_service/mod.rs	Switches to #[async_trait(?Send)].
paddler/src/balancer/management_service/mod.rs	Switches to #[async_trait(?Send)].
paddler/src/balancer/inference_service/mod.rs	Switches to #[async_trait(?Send)].
paddler/src/balancer/compatibility/openai_service/mod.rs	Switches to #[async_trait(?Send)].
package-lock.json	Adds "peer": true metadata to multiple entries.

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