Add Makefile with build targets and script to dynamically update cache version for client builds

scripts/cache-version.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+# Generiert eine Cache-Version basierend auf aktuellem Timestamp
+
+VERSION=$(date +%s%3N)  # Unix timestamp in Millisekunden
+JS_FILE="cmd/client/web/game.js"
+HTML_FILE="cmd/client/web/index.html"
+
+echo "🔄 Updating cache version to: $VERSION"
+
+# Ersetze CACHE_VERSION in game.js und BUILD_VERSION in index.html
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    # macOS
+    sed -i '' "s/const CACHE_VERSION = .*;/const CACHE_VERSION = $VERSION;/" "$JS_FILE"
+    sed -i '' "s/const BUILD_VERSION = .*;/const BUILD_VERSION = $VERSION;/" "$HTML_FILE"
+else
+    # Linux
+    sed -i "s/const CACHE_VERSION = .*;/const CACHE_VERSION = $VERSION;/" "$JS_FILE"
+    sed -i "s/const BUILD_VERSION = .*;/const BUILD_VERSION = $VERSION;/" "$HTML_FILE"
+fi
+
+echo "✅ Cache version updated: $JS_FILE and $HTML_FILE"