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.

packages/voice_engine_v2/fixtures/event_logs/capabilities_lifecycle.json

@@ -0,0 +1,48 @@
+{
+	"name": "capabilities_lifecycle",
+	"events": [
+		{
+			"type": "capabilities.changed",
+			"capabilities": {
+				"connect": true,
+				"microphone": true,
+				"camera": true,
+				"screen": true,
+				"screenAudio": true,
+				"outputDevice": true,
+				"participantVolume": true,
+				"remoteTrackSubscription": true,
+				"dataChannel": true,
+				"stats": true,
+				"nativeVideoFrames": true,
+				"hardwareEncoding": true,
+				"zeroCopyScreenTransport": true,
+				"nativeAudioTaps": true
+			}
+		},
+		{"type": "capabilities.hardwareEncoderQueryRequested"},
+		{
+			"type": "capabilities.hardwareEncoderChanged",
+			"operationId": 1,
+			"capabilities": {
+				"available": true,
+				"backend": "nvenc",
+				"compiled": true,
+				"runtime": true,
+				"codecs": ["h264", "hevc"],
+				"zeroCopy": true,
+				"nativeInputs": ["d3d11-texture"]
+			}
+		}
+	],
+	"expectedCommands": [[], [{"type": "capabilities.queryHardwareEncoder", "operationId": 1}], []],
+	"expected": {
+		"nextOperationId": 2,
+		"hardwareEncoderOperationId": null,
+		"hardwareEncoderFailureCode": null,
+		"hardwareEncoderBackend": "nvenc",
+		"hasZeroCopyNativeInput": true,
+		"hasNativeNvencH264": true,
+		"hasNativeNvencH265": true
+	}
+}