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/package.json

@@ -0,0 +1,33 @@
+{
+	"name": "@fluxer/webrtc-sender",
+	"version": "0.0.0",
+	"description": "Native main-process WebRTC video sender (LiveKit/libwebrtc) for publishing game/screen capture without a renderer hop",
+	"private": true,
+	"license": "AGPL-3.0-or-later",
+	"os": [
+		"darwin",
+		"linux",
+		"win32"
+	],
+	"cpu": [
+		"x64",
+		"arm64"
+	],
+	"main": "index.js",
+	"types": "index.d.ts",
+	"files": [
+		"index.js",
+		"index.d.ts",
+		"webrtc-sender.darwin-x64.node",
+		"webrtc-sender.darwin-arm64.node",
+		"webrtc-sender.linux-x64-gnu.node",
+		"webrtc-sender.linux-arm64-gnu.node",
+		"webrtc-sender.win32-x64-msvc.node",
+		"webrtc-sender.win32-arm64-msvc.node"
+	],
+	"scripts": {
+		"build": "cargo run --locked --quiet --manifest-path ../../../tools/ci/Cargo.toml -- build-desktop-native-addon",
+		"test": "cargo run --locked --quiet --manifest-path ../../../tools/ci/Cargo.toml -- test-webrtc-sender-rust && node --test index.test.mjs scripts/livekit-harness.test.mjs",
+		"test:livekit": "node scripts/livekit-harness.mjs"
+	}
+}