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/release_date.go

@@ -0,0 +1,55 @@
+package parser
+
+import (
+	"fmt"
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/PuerkitoBio/goquery"
+)
+
+const wikiChampionListURL = "https://leagueoflegends.fandom.com/wiki/List_of_champions"
+
+// EnrichReleaseDates scrapes the LoL Wiki to add release year to each champion.
+func EnrichReleaseDates(champions []ChampionResult) ([]ChampionResult, error) {
+	resp, err := http.Get(wikiChampionListURL)
+	if err != nil {
+		return nil, fmt.Errorf("fetching wiki champion list: %w", err)
+	}
+	defer resp.Body.Close()
+
+	doc, err := goquery.NewDocumentFromReader(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("parsing wiki HTML: %w", err)
+	}
+
+	// Build a name-to-index map for O(1) lookups.
+	nameIndex := buildNameIndex(champions)
+
+	// The first <tbody> contains the champion list table.
+	doc.Find("tbody").First().Find("tr").Each(func(_ int, row *goquery.Selection) {
+		cols := row.Find("td")
+		if cols.Length() == 0 {
+			return
+		}
+
+		name := strings.TrimSpace(cols.Eq(1).Find("a").AttrOr("title", ""))
+		name = strings.ReplaceAll(name, "/LoL", "")
+
+		dateText := strings.TrimSpace(cols.Eq(3).Text())
+		parts := strings.Split(dateText, "-")
+		yearStr := parts[len(parts)-1]
+
+		year, err := strconv.Atoi(yearStr)
+		if err != nil {
+			return
+		}
+
+		if idx, ok := nameIndex[name]; ok {
+			champions[idx].ReleaseDate = year
+		}
+	})
+
+	return champions, nil
+}