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.

tools/ci/Cargo.toml

@@ -0,0 +1,26 @@
+[package]
+name = "fluxer-ci"
+version = "0.1.0"
+edition = "2024"
+license = "AGPL-3.0-or-later"
+
+[dependencies]
+anyhow = "1.0.102"
+aws-config = "1.8.18"
+aws-sdk-s3 = "1.135.0"
+base64 = "0.22.1"
+bytes = "1.11.1"
+chrono = "0.4.45"
+clap = { version = "4.6.1", features = ["derive"] }
+flate2 = "1.1.9"
+hex = "0.4.3"
+md-5 = "0.11.0"
+reqwest = { version = "0.13.4", default-features = false, features = ["json", "rustls"] }
+serde = { version = "1.0.228", features = ["derive"] }
+serde_json = "1.0.150"
+sha2 = "0.11.0"
+tar = "0.4.46"
+tempfile = "3.27.0"
+tokio = { version = "1.52.3", features = ["fs", "io-util", "macros", "process", "rt-multi-thread", "signal", "sync", "time"] }
+walkdir = "2.5.0"
+zip = { version = "8.6.0", default-features = false, features = ["deflate"] }