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/.cargo/config.toml

@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+# Statically link the Microsoft C/C++ runtime into every native Rust addon we
+# ship on Windows. Without this, the .node imports VCRUNTIME140.dll and the
+# msvcp/msvcr family, which require the VC++ 2015-2022 redistributable to be
+# installed system-wide. Fresh Windows boxes (and Windows IoT / LTSC variants)
+# don't have it, so dlopen fails with ERR_DLOPEN_FAILED "The specified module
+# could not be found." even though the .node file itself is present.
+#
+# +crt-static makes the runtime part of the .node itself. Universal CRT API
+# sets (api-ms-win-crt-*.dll) are guaranteed present on Windows 10+ and remain
+# dynamic; only the VC++-specific layer goes static.
+#
+# Scoped per-target so Linux and macOS builds are unaffected. Cargo walks
+# parent directories looking for `.cargo/config.toml`, so this file applies to
+# every crate under `fluxer_desktop/native/` even though each addon has its
+# own `[workspace]`.
+
+[target.x86_64-pc-windows-msvc]
+rustflags = ["-C", "target-feature=+crt-static"]
+
+[target.aarch64-pc-windows-msvc]
+rustflags = ["-C", "target-feature=+crt-static"]
+
+# 32-bit injected game-capture hook/layer (for capturing 32-bit games from the
+# 64-bit app). Same rationale: the DLL is LoadLibrary'd into an arbitrary game
+# process that may not have the 32-bit VC++ redistributable, so the runtime
+# must be static.
+[target.i686-pc-windows-msvc]
+rustflags = ["-C", "target-feature=+crt-static"]