Add Borealis GUI for patch extraction on Switch.

Replace the console UI with a Borealis-based flow, bundle ROMFS assets and
borealis as a submodule, and apply small upstream patches at build time.
Self-delete runs after romfsExit on quit so the NRO can be removed like the
old console build.

source/main.cpp

@@ -0,0 +1,25 @@
+#include <borealis.hpp>
+
+#include "extractor.hpp"
+#include "patch_activity.hpp"
+
+int main(int argc, char* argv[]) {
+    (void)argc;
+    (void)argv;
+
+    brls::Logger::setLogLevel(brls::LogLevel::WARNING);
+
+    if (!brls::Application::init()) {
+        brls::Logger::error("Borealis init failed");
+        return 1;
+    }
+
+    brls::Application::createWindow("PatchExtractor");
+    brls::Application::setGlobalQuit(true);
+    brls::Application::pushActivity(new PatchActivity());
+
+    while (brls::Application::mainLoop()) {}
+
+    PatchExtractor::tryDeleteSelfOnExit();
+    return 0;
+}