v0.35.1: performance, AGPL licensing and documentation overhaul

- Web Server reads static files inline; proxy middleware chain flattened
- About window with license summary and project links; AGPL-3.0-or-later
- Rewritten documentation: feature list, screenshots, performance guide
- Fix false spikes in per-Vhost request-rate charts

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMsgSXoK4Bph2vU6fSBkAH

scripts/start_stream_backends.sh

@@ -1,7 +1,6 @@
 #!/usr/bin/env bash
 # Start two TCP and two UDP mock backends for RustProxy Stream tests.
 # Usage: ./start_stream_backends.sh [bind-host]
-# Defaults to loopback for safety. Use 0.0.0.0 only on a controlled test network.
 set -euo pipefail
 
 DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"