feat: initial OpenFUT Launcher

GUI desktop app (egui/eframe) that manages the openfut-core and
openfut-bridge services with a single window.

- Dashboard: start/stop each service independently or together; live
  status indicators; quick-status for cert and hosts
- Logs: real-time stdout/stderr from both processes, colour-coded by
  level, follow mode and manual clear
- Setup: add/remove EA hostname redirects in /etc/hosts (pkexec/sudo);
  install the bridge TLS cert into the system CA store
- Config: all binary paths and env vars editable in-app; persisted to
  ~/.config/openfut-launcher/config.json

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main.rs

@@ -0,0 +1,21 @@
+mod app;
+mod config;
+mod logs;
+mod process;
+mod setup;
+
+fn main() -> eframe::Result<()> {
+    let options = eframe::NativeOptions {
+        viewport: egui::ViewportBuilder::default()
+            .with_title("OpenFUT Launcher")
+            .with_inner_size([780.0, 560.0])
+            .with_min_inner_size([600.0, 400.0]),
+        ..Default::default()
+    };
+
+    eframe::run_native(
+        "OpenFUT Launcher",
+        options,
+        Box::new(|cc| Ok(Box::new(app::LauncherApp::new(cc)))),
+    )
+}