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/region.go

@@ -0,0 +1,63 @@
+package parser
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+var regions = []string{
+	"bandle-city", "bilgewater", "demacia", "ionia", "ixtal", "noxus",
+	"piltover", "shadow-isles", "shurima", "mount-targon", "freljord", "void", "zaun",
+}
+
+// factionResponse represents the Universe API faction endpoint response.
+type factionResponse struct {
+	AssociatedChampions []struct {
+		Name string `json:"name"`
+	} `json:"associated-champions"`
+}
+
+// EnrichRegions fetches faction affiliations and adds region data to each champion.
+func EnrichRegions(champions []ChampionResult) ([]ChampionResult, error) {
+	nameIndex := buildNameIndex(champions)
+
+	for _, faction := range regions {
+		url := fmt.Sprintf("https://universe-meeps.leagueoflegends.com/v1/en_us/factions/%s/index.json", faction)
+		resp, err := http.Get(url)
+		if err != nil {
+			fmt.Printf("Can't load data for faction %s: %v\n", faction, err)
+			continue
+		}
+
+		var fResp factionResponse
+		if err := json.NewDecoder(resp.Body).Decode(&fResp); err != nil {
+			resp.Body.Close()
+			fmt.Printf("Can't parse data for faction %s: %v\n", faction, err)
+			continue
+		}
+		resp.Body.Close()
+
+		for _, assoc := range fResp.AssociatedChampions {
+			// Normalize Unicode apostrophe to ASCII.
+			champName := strings.ReplaceAll(assoc.Name, "\u2019", "'")
+			if idx, ok := nameIndex[champName]; ok {
+				if champions[idx].Region == "" {
+					champions[idx].Region = faction
+				} else {
+					champions[idx].Region += "," + faction
+				}
+			}
+		}
+	}
+
+	// Default to "runeterra" for champions with no faction.
+	for i := range champions {
+		if champions[i].Region == "" {
+			champions[i].Region = "runeterra"
+		}
+	}
+
+	return champions, nil
+}