feat: Add local testing API and enhance orion/orion-server

[yyjeqhc]

Part of #1274
feat: Add local testing API and enhance orion/orion-server with heartbeat and task scheduling
1.Added a new API in mono to enable local testing without login requirement
2.Implemented heartbeat mechanism in orion-server and orion for persistent connection and reconnection
3.Added task scheduling and status checking features in orion-server and orion

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Name	Status	Preview	Comments	Updated (UTC)
mega	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 4, 2025 5:53am

[Copilot]

Pull Request Overview

This PR introduces distributed build capabilities to the Orion system by implementing a client-server architecture with persistent WebSocket connections, heartbeat monitoring, and task scheduling. The changes enable local testing without authentication and enhance the build system with robust connection management.

• Added WebSocket-based communication protocol between workers and server with automatic reconnection
• Implemented heartbeat mechanism and health monitoring for worker nodes
• Enhanced task scheduling with proper worker status tracking and build completion handling

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
orion/src/ws.rs	Complete rewrite implementing persistent WebSocket client with heartbeat and reconnection logic
orion/src/main.rs	Updated to use new WebSocket client with configurable worker ID and server address
orion/src/buck_controller.rs	Enhanced build execution with better error handling and structured logging
orion/src/api.rs	Simplified build API removing global state tracking in favor of WebSocket communication
orion/.env	Updated server endpoint for local development
orion-server/src/server.rs	Added health check background task and worker timeout management
orion-server/src/model/builds.rs	Updated database model to support optional end_at field and better documentation
orion-server/src/main.rs	Enhanced logging configuration and documentation
orion-server/src/api.rs	Major rewrite implementing worker management, task scheduling, and build output streaming
orion-server/Cargo.toml	Added chrono dependency for timestamp handling
orion-server/.env	Updated configuration paths and ports for local testing
mono/src/api/mr/mr_router.rs	Added unauthenticated merge endpoint for local testing

Comments suppressed due to low confidence (2)

orion-server/src/api.rs:295

• The method random_range does not exist on the rand::rng() type in the rand crate. The correct method should be gen_range for generating random numbers within a range.

        rng.random_range(0..idle_workers.len())

orion-server/src/api.rs:649

• The test imports IndexedRandom but doesn't use it in the actual test. The test should either use this import or remove it and test the actual random selection logic used in the production code.

        use rand::seq::IndexedRandom;

[Copilot]

The function has unreachable code after the loop. The child.wait().await? at the end will never be executed because the loop can only exit via break statements, and when it breaks, the function returns early. This unreachable code should be removed.

[Ivanbeethoven]

LGTM