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/Cargo.toml

@@ -0,0 +1,46 @@
+[package]
+name = "fluxer_desktop_native_fuzz"
+version = "0.0.0"
+edition = "2024"
+publish = false
+
+[workspace]
+resolver = "2"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+arbitrary = {version = "1.4", features = ["derive"]}
+fluxer_desktop_native = {path = ".."}
+libfuzzer-sys = "0.4"
+
+[[bin]]
+name = "routing"
+path = "fuzz_targets/routing.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "pid_payload"
+path = "fuzz_targets/pid_payload.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "audio_converter"
+path = "fuzz_targets/audio_converter.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "evdev_event"
+path = "fuzz_targets/evdev_event.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "process_tree"
+path = "fuzz_targets/process_tree.rs"
+test = false
+doc = false