fix: PHP versions fallback and auto-migrate on panel start

internal/phpversions/versions.go

@@ -0,0 +1,12 @@
+package phpversions
+
+var Defaults = []string{"8.1", "8.2", "8.3", "8.4"}
+
+func Contains(version string) bool {
+	for _, v := range Defaults {
+		if v == version {
+			return true
+		}
+	}
+	return false
+}