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/webrtc-sender/vendor/tract-linalg-0.19.16/src/frame.rs

@@ -0,0 +1,17 @@
+#[macro_use]
+pub mod element_wise;
+#[macro_use]
+pub mod lut;
+#[macro_use]
+pub mod mmm;
+pub mod pack;
+#[macro_use]
+pub mod sigmoid;
+#[macro_use]
+pub mod tanh;
+
+pub use pack::Packer;
+pub use pack::PackingWriter;
+
+pub use self::element_wise::{ElementWise, ElementWiseImpl};
+pub use self::mmm::{MatMatMul, MatMatMulImpl};