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/tls/external_paths.rs

@@ -104,8 +104,7 @@ fn read_pem_with_policy(
     #[cfg(unix)]
     {
         use std::os::unix::fs::OpenOptionsExt;
-        // Reject special files below without blocking while opening a FIFO.
-        // O_NONBLOCK has no effect on ordinary certificate/key files.
+        // O_NONBLOCK avoids hanging on a FIFO; special files are rejected below.
         options.custom_flags(libc::O_NOFOLLOW | libc::O_NONBLOCK);
     }
     let file = options