baseline: api+gui traffic mode + candidates picker

Snapshot before app-launcher (cgroup/mark) work; ignore binaries/backups.

.gitignore

@@ -0,0 +1,22 @@
+# Build artifacts / binaries
+smartdns
+selective-vpn-api.tar.gz
+selective-vpn-api/selective-vpn-api
+
+# Python caches
+__pycache__/
+*.pyc
+
+# GUI legacy copies / archives
+selective-vpn-gui/1/
+selective-vpn-gui/2/
+selective-vpn-gui/*.zip
+selective-vpn-gui/main.go
+
+# Backups / scratch
+*.bak
+*.bak_*
+*.bak.*
+*.tmp
+selective-vpn-api/works
+