mark elang only fns with erlang target

src/squall.gleam

···
   )
 }
 
+@target(erlang)
 fn generate_with_env() {
   io.println("Error: GRAPHQL_ENDPOINT environment variable not set")
   io.println("Usage: gleam run -m squall generate <endpoint>")
   Nil
 }
 
+@target(erlang)
 fn generate(endpoint: String) {
   io.println("🌊 Squall - GraphQL Code Generator")
   io.println("================================\n")

src/squall/internal/discovery.gleam

···
 }
 
 /// Find all .gql files in graphql/ directories under the given root path
+@target(erlang)
 pub fn find_graphql_files(root: String) -> Result(List(GraphQLFile), Error) {
   case walk_directory(root) {
     Ok(paths) -> {
···
 }
 
 /// Read a GraphQL file and extract its operation name
+@target(erlang)
 fn read_graphql_file(path: String) -> Result(GraphQLFile, Error) {
   use operation_name <- result.try(extract_operation_name(path))
   use content <- result.try(
···
 }
 
 /// Recursively walk a directory and return all file paths
+@target(erlang)
 fn walk_directory(path: String) -> Result(List(String), simplifile.FileError) {
   use is_dir <- result.try(simplifile.is_directory(path))
 
···
   }
 }
 
+@target(erlang)
 fn simplifile_error(err: simplifile.FileError) -> String {
   case err {
     simplifile.Enoent -> "File or directory not found"