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/proxy.go

@@ -11,13 +11,17 @@ const RunInSerial = 0
 var (
 	// DefaultProperties is a map of all valid proxy properties with corresponding default property values
 	DefaultProperties = map[string]string{
-		"disabled": "false",
-		"type":     "",
+		"disabled":       "false",
+		"proxy-port":     "",
+		"proxy-ssl-port": "",
+		"type":           "",
 	}
 
 	// GlobalProperties is a map of all valid global proxy properties
 	GlobalProperties = map[string]bool{
-		"type": true,
+		"proxy-port":     true,
+		"proxy-ssl-port": true,
+		"type":           true,
 	}
 )