FlowGate development 75a07d246aba

Development build from commit 75a07d2.
Verified by GitHub Actions run 34386091996, including the packaged-app smoke test.
macOS Apple Silicon only. This build is not Developer ID signed or notarized.
Use manual HTTP/SOCKS mode; privileged helper/TUN acceptance remains deferred.
FlowGate source, build provenance and SHA-256 checksum are included.