Add Pokemon Legends: Z-A to the game list

Add version group entry with region_id 0 (no PokeAPI region) and region
"lumiose". The Go fetch tool now skips route fetching for region_id 0 so
manually provided data won't be overwritten by re-runs. Includes
placeholder data file and box art.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tools/fetch-pokeapi/main.go

@@ -132,6 +132,10 @@ func main() {
 	pokeIDCollector := NewPokeIDCollector()
 
 	for vgKey, vgInfo := range *versionGroups {
+		if vgInfo.RegionID == 0 {
+			fmt.Printf("\nSkipping %s (no PokeAPI region, data managed manually)\n", vgKey)
+			continue
+		}
 		for _, verName := range vgInfo.Versions {
 			routes, err := processVersion(ctx, client, verName, vgInfo, vgKey, routeOrder, specialEnc, pokeIDCollector)
 			if err != nil {