fix: rename Mathsumoto to Zundamon

Sources/zundamon/MessageHandler.swift

@@ -21,9 +21,9 @@ struct MessageHandler {
                 case "domath": try await Wolfram.handleMath(args, client: client, ctx: ctx)
                 default: break
             }
-        } else if ctx.mentions.contains(where: { $0.id == Mathsumoto.ownID }) {
+        } else if ctx.mentions.contains(where: { $0.id == Zundamon.ownID }) {
             if ctx.content
-                .replacingOccurrences(of: "<@\(Mathsumoto.ownID!.rawValue)>", with: "")
+                .replacingOccurrences(of: "<@\(Zundamon.ownID!.rawValue)>", with: "")
                 .trimmingCharacters(in: .whitespacesAndNewlines)
                 .count == 0,
                 let zundaGif = MessageHandler.zundaGifData

Sources/zundamon/Zundamon.swift

@@ -3,7 +3,7 @@ import DiscordBM
 import SwiftDotenv
 
 @main
-struct Mathsumoto {
+struct Zundamon {
     nonisolated(unsafe) static private(set) var ownID: UserSnowflake? = nil
 
     static func main() async throws {