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/platform-info/index.d.ts

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+export type PlatformGpuInfoSource = 'metal' | 'dxgi' | 'linux-sysfs';
+
+export interface PlatformGpuDeviceInfo {
+	active: boolean;
+	vendorId: number;
+	deviceId: number;
+	vendorName?: string;
+	deviceString?: string;
+	driverVendor?: string;
+	driverVersion?: string;
+	dedicatedVideoMemory?: number;
+	sharedSystemMemory?: number;
+	subsystemVendorId?: number;
+	subsystemDeviceId?: number;
+	registryId?: string;
+	adapterLuid?: string;
+	pciPath?: string;
+	integrated?: boolean;
+	removable?: boolean;
+	headless?: boolean;
+	source: PlatformGpuInfoSource;
+}
+
+export interface PlatformGpuInfo {
+	devices: ReadonlyArray<PlatformGpuDeviceInfo>;
+	source: PlatformGpuInfoSource;
+	error?: string;
+}
+
+export declare const getGpuInfo: (() => PlatformGpuInfo) | null;
+export declare const loadError: Error | null;