Create stats endpoint

[P4ST4S]

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[Copilot]

Pull request overview

This PR adds a statistics endpoint (/stats) to the load balancer that exposes backend server health metrics including uptime and memory usage. The implementation replaces the simulated traefik/whoami backends with custom Go servers that expose a /health endpoint for metrics collection.

Key changes:

• Implemented a /stats endpoint that returns JSON with per-backend status, uptime, and memory usage
• Added health metric collection from backend servers every 20 seconds during health checks
• Replaced Docker Compose backend services with custom Go servers that expose runtime statistics

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
docker-compose.yml	Replaced traefik/whoami images with custom Go backend servers built from Dockerfile.backend
Dockerfile.backend	New Dockerfile for building the custom backend server with health endpoint
Dockerfile	Updated build command to build all files in cmd/lb directory instead of just main.go
cmd/server/main.go	New backend server implementation with /health endpoint that reports memory usage
cmd/lb/main.go	Added stats collection from backend /health endpoints and registered /stats handler
cmd/lb/stats.go	New stats handler that returns JSON statistics for all backends
core/backend.go	Added uptime tracking, memory usage fields, and helper methods for formatting statistics
core/pool.go	Added pool-level statistics aggregation methods and duration formatting utilities

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