Add native self-hosted instance connection to fluxer_desktop

Trimmed monorepo checkout (fluxer_desktop + packages/voice_engine_v2 +
tools/ci) with a "Connect to a Different Server" menu item and popout
that lets the desktop app switch to any self-hosted Fluxer instance,
plus fixes for well-known discovery on single-domain self-hosted
deployments and a false-positive ERR_ABORTED on same-origin client
redirects during the switch. Defaults to chat.fluxr.chat and uses an
isolated userData directory from the official build.

fluxer_desktop/native/rust/fuzz/fuzz_targets/evdev_event.rs

@@ -0,0 +1,20 @@
+#![no_main]
+
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use fluxer_desktop_native::linux_evdev::event::{
+    InputEvent, parse_input_event, parse_input_events,
+};
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &[u8]| {
+    let _ = parse_input_event(data);
+    let mut count = 0_usize;
+    for event in parse_input_events(data) {
+        let _ = event.time_sec ^ event.time_usec;
+        let _ = event.event_type ^ event.code;
+        let _ = event.value;
+        count += 1;
+    }
+    assert_eq!(data.len() / InputEvent::BYTE_LEN, count);
+});