feat: rewrite LoLdleData in Go

4-stage pipeline: fetch ddragon champions, enrich with release dates
(wiki scrape), regions (Universe API), and lanes (wiki scrape).
Concurrent gender detection via goroutines with semaphore.

data/parser/helpers.go

@@ -0,0 +1,10 @@
+package parser
+
+// buildNameIndex creates a map from champion name to slice index for O(1) lookups.
+func buildNameIndex(champions []ChampionResult) map[string]int {
+	idx := make(map[string]int, len(champions))
+	for i, c := range champions {
+		idx[c.Name] = i
+	}
+	return idx
+}