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/win-game-capture/compatibility.json

@@ -0,0 +1,6 @@
+{
+	"$comment": "Optional per-process game-capture injection policy override. Placed next to the native addon, it augments the deny/force-cpu lists compiled into the addon. Entries are matched case-insensitively by executable file name (e.g. game.exe); paths are reduced to their final component. 'deny' refuses injection; 'allow' opts a process back in past the built-in deny list; 'forceCpu' keeps injection but prefers CPU readback over the shared-texture fast path. A missing or malformed file falls back to the embedded defaults.",
+	"deny": [],
+	"allow": [],
+	"forceCpu": []
+}