refactor: move firmware workspace under firmware

firmware/libs/kaptan-config-derive/tests/ui/duplicate_range.rs

@@ -0,0 +1,9 @@
+use kaptan_config_derive::ConfigValidate;
+
+#[derive(ConfigValidate)]
+struct DuplicateRange {
+    #[config(id = 7, range(min = 1), range(min = 2))]
+    value: u32,
+}
+
+fn main() {}