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/audit_css_usage.py

@@ -99,9 +99,7 @@ def structural_inventory(paths: list[Path]) -> dict:
         families = [tuple(sorted({family for selector in entry['selectors']
                                   for family in VENDOR_SELECTOR.findall(selector)}))
                     for entry in entries]
-        # A browser can reject an entire comma-separated selector list when it
-        # contains another engine's pseudo-element. Keep one body per compatible
-        # family, while still rejecting copies within the same family.
+        # Vendor pseudo-element families legitimately repeat one rule body.
         vendor_only = (any(families) and all(len(family) <= 1 for family in families)
                        and len(families) == len(set(families)))
         repeated_bodies.append({'scope': list(scope), 'rules': entries,