fix: move proxy-port properties to proxy plugin and fix CI failures

- Move proxy-port and proxy-ssl-port properties from ports plugin to
  proxy plugin where they conceptually belong
- Generalize proxy:set to handle any property (matching ps:set pattern)
  instead of only handling the type property
- Fix apps:set --global flag parsing (pflag treats --global as a flag,
  not an argument — must be defined explicitly like ps:set does)
- Add missing property-functions source to scheduler-docker-local
  shell scripts (scheduler-enter, scheduler-run, scheduler-deploy,
  check-deploy, bin/scheduler-deploy-process-container)
- Update nginx-vhosts property references from ports to proxy plugin
- Update tests to use proxy:set for proxy-port properties

plugins/proxy/src/subcommands/subcommands.go

@@ -59,12 +59,14 @@ func main() {
 		global := args.Bool("global", false, "--global: set a global property")
 		args.Parse(os.Args[2:])
 		appName := args.Arg(0)
-		proxyType := args.Arg(1)
+		property := args.Arg(1)
+		value := args.Arg(2)
 		if *global {
 			appName = "--global"
-			proxyType = args.Arg(0)
+			property = args.Arg(0)
+			value = args.Arg(1)
 		}
-		err = proxy.CommandSet(appName, proxyType)
+		err = proxy.CommandSet(appName, property, value)
 	default:
 		err = fmt.Errorf("Invalid plugin subcommand call: %s", subcommand)
 	}