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

src/cache/lifecycle.rs

@@ -23,6 +23,7 @@ impl Cache {
             cold_read_bytes_active: AtomicU64::new(0),
             revalidating: Mutex::new(HashSet::new()),
             fill_flights: Mutex::new(HashMap::new()),
+            uncacheable_until: Mutex::new(HashMap::new()),
             fill_flight_sequence: AtomicU64::new(0),
             collapse_waiters: AtomicU64::new(0),
             bans: Mutex::new(Vec::new()),
@@ -75,6 +76,7 @@ impl Cache {
             cold_read_bytes_active: AtomicU64::new(0),
             revalidating: Mutex::new(HashSet::new()),
             fill_flights: Mutex::new(HashMap::new()),
+            uncacheable_until: Mutex::new(HashMap::new()),
             fill_flight_sequence: AtomicU64::new(0),
             collapse_waiters: AtomicU64::new(0),
             bans: Mutex::new(Vec::new()),