feat: Real Latency Measurement (TCP) [PR #12]

[wallydz-bot]

PR VPNht#12: Real Latency Measurement

Summary

Replaces placeholder latency logic with real TCP-based latency measurement. Supports single-sample and median-of-N measurement modes.

Changes

Backend (src-tauri/)

• src/latency.rs: Real latency measurement.
  • measure_tcp_latency(): TCP connect timing to host:port with configurable timeout.
  • measure_latency_median(): Multiple samples with median calculation for accuracy.
  • Structured tracing for all measurements (success and failure).

How It Works

1. Opens a TCP connection to the server's WireGuard port.
2. Measures the time from connect() to established connection.
3. For median mode, takes N samples and returns the middle value.

Files Changed

• src-tauri/src/latency.rs (new)