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.

Cargo.toml

@@ -0,0 +1,14 @@
+[workspace]
+members = [
+	"tools/ci",
+]
+exclude = [
+	"packages/markdown_parser/rust/fuzz",
+	"fluxer_desktop/native/webrtc-sender/vendor/tract-linalg-0.19.16",
+	"fluxer_desktop/native/webrtc-sender/vendor/tract-linalg-0.23.1",
+]
+resolver = "2"
+
+[workspace.package]
+edition = "2024"
+license = "AGPL-3.0-or-later"