Add macOS CI build, RPM, and Nix packaging

- GitHub Actions workflow builds DMGs for both Intel and Apple Silicon
- Update .pro file: macOS 11+ target, Homebrew paths instead of MacPorts
- Add RPM spec + build script for Fedora/RHEL/openSUSE
- Add Nix derivation with autoPatchelfHook
- Update Homebrew formula to support macOS (Intel + ARM64)

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

packaging/homebrew/triangles.rb

@@ -4,16 +4,30 @@ class Triangles < Formula
   license "MIT"
   version "5.1.4"
 
+  on_macos do
+    if Hardware::CPU.intel?
+      url "https://github.com/SamiAhmed7777/triangles_v5/releases/download/v5.1.4/Cryptographic-Triangles-v5.1.4-macos-x64.dmg"
+      sha256 "PLACEHOLDER_X64_HASH"
+    else
+      url "https://github.com/SamiAhmed7777/triangles_v5/releases/download/v5.1.4/Cryptographic-Triangles-v5.1.4-macos-arm64.dmg"
+      sha256 "PLACEHOLDER_ARM64_HASH"
+    end
+  end
+
   on_linux do
     url "https://github.com/SamiAhmed7777/triangles_v5/releases/download/v5.1.4/trianglesd-linux"
     sha256 "6f5c19d34a2e1f6cdadee095d9e11b25d18b41a0d1602a163ffca7ec80b3da37"
   end
 
   depends_on "openssl@3"
-  depends_on :linux
 
   def install
-    bin.install "trianglesd-linux" => "trianglesd"
+    if OS.mac?
+      prefix.install "Triangles-Qt.app"
+      bin.write_exec_script prefix/"Triangles-Qt.app/Contents/MacOS/Triangles-Qt"
+    else
+      bin.install "trianglesd-linux" => "trianglesd"
+    end
   end
 
   service do
@@ -23,6 +37,10 @@ class Triangles < Formula
   end
 
   test do
-    system "#{bin}/trianglesd", "-version"
+    if OS.mac?
+      assert_predicate prefix/"Triangles-Qt.app", :exist?
+    else
+      system "#{bin}/trianglesd", "-version"
+    end
   end
 end