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

docs/DASHBOARD.md

@@ -14,7 +14,7 @@ page has its own stylesheet.
 
 The Overview contains live counters, charts and optional backend, cache, PHP, Docker and Stream cards. Under **Settings → Appearance → Dashboard layout** or the Overview editor, configure visibility, order, card width, density and the number of history samples. A hidden card stops consuming its optional browser-side visualization work but does not turn off its underlying proxy feature.
 
-In 0.34.1, the unlocked Overview layout exposes a single **Save and lock** action (plus Cancel), removing the redundant lock-and-save button.
+The unlocked Overview layout exposes a single **Save and lock** action (plus Cancel), removing the redundant lock-and-save button.
 
 **Dashboard Presets** supports up to **16 named layouts per administrator**. Save, load, rename, overwrite and delete presets; a factory layout can be restored. Presets preserve the dashboard arrangement, not the live traffic values. Interface theme, scale and other display settings are also account-scoped and do not alter proxy routing or rewrite shared configuration.