feat: modernize all project dependencies

Major Updates:
- Upgrade Phaser 2.6.2 → Phaser CE 2.20.2 (actively maintained community edition)
- Update Node.js 8.17.0 → 22.21.1 (latest LTS)
- Upgrade Gulp 4.0.2 → 5.0.1
- Update Babel core and preset-env to 7.28.6

Dev Dependency Updates:
- browser-sync: 2.29.3 → 3.0.4
- browserify: 17.0.0 → 17.0.1
- del: 6.1.1 → 8.0.1
- prettier: 3.0.3 → 3.8.0
- yargs: 17.7.2 → 18.0.0
- Replace deprecated gulp-util with fancy-log 2.0.0

Configuration Changes:
- Update .nvmrc to Node 22.21.1
- Update package.json engines to require Node >=18.0.0
- Modernize Babel config to target modern browsers, drop IE11 support
- Update gulpfile.js to use fancy-log instead of gulp-util
- Fix yargs argv parsing for v18+ compatibility
- Update Phaser path to use phaser-ce build directory

All changes tested and verified. Game builds and runs successfully.

Author: claude

.babelrc

@@ -5,8 +5,9 @@
       {
         "targets": {
           "browsers": [
-            "last 2 versions",
-            "ie >= 11"
+            "defaults",
+            "not dead",
+            "not IE 11"
           ]
         }
       }

.nvmrc

@@ -1 +1 @@
-8.17.0
+22.21.1

gulpfile.js

@@ -1,8 +1,8 @@
 const fs = require("fs");
 const path = require("path");
 const gulp = require("gulp");
-const argv = require("yargs").argv;
-const gutil = require("gulp-util");
+const argv = require("yargs")(process.argv.slice(2)).argv;
+const log = require("fancy-log");
 const source = require("vinyl-source-stream");
 const buffer = require("gulp-buffer");
 const uglify = require("gulp-uglify");
@@ -15,7 +15,7 @@ const browserSync = require("browser-sync");
 /**
  * Using different folders/file names? Change these constants:
  */
-const PHASER_PATH = "./node_modules/phaser/build/";
+const PHASER_PATH = "./node_modules/phaser-ce/build/";
 const BUILD_PATH = "./build";
 const SCRIPTS_PATH = BUILD_PATH + "/scripts";
 const SOURCE_PATH = "./src";
@@ -37,9 +37,9 @@ function isProduction() {
  */
 function logBuildMode() {
   if (isProduction()) {
-    gutil.log(gutil.colors.green("Running production build..."));
+    log.info("Running production build...");
   } else {
-    gutil.log(gutil.colors.yellow("Running development build..."));
+    log.warn("Running development build...");
   }
 }
 
@@ -110,7 +110,7 @@ function build() {
     .transform(babelify)
     .bundle()
     .on("error", function(error) {
-      gutil.log(gutil.colors.red("[Build Error]", error.message));
+      log.error("[Build Error]", error.message);
       this.emit("end");
     })
     .pipe(gulpif(!isProduction(), exorcist(sourcemapPath)))