Resolve fun pathing issue on Windows

Not replacing it, means `language/language.proto` is not found in the Map on Windows. Updating just the key, results in a duplicate file found with different path, as it still loads the import and from the directory pathing.

api/src/main/java/io/kafbat/ui/serdes/builtin/ProtobufFileSerde.java

@@ -408,7 +408,7 @@ private Map<String, ProtoFile> loadFilesWithLocations() {
         files.filter(p -> !Files.isDirectory(p) && p.toString().endsWith(".proto"))
             .forEach(path -> {
               // relative path will be used as "import" statement
-              String relativePath = baseLocation.relativize(path).toString();
+              String relativePath = baseLocation.relativize(path).toString().replace("\\", "/");
               var protoFileElement = ProtoParser.Companion.parse(
                   Location.get(baseLocation.toString(), relativePath),
                   readFileAsString(path)