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

Makefile

@@ -0,0 +1,40 @@
+.PHONY: build-wasm build-native build-server clean update-cache
+
+# Build WASM Client mit Cache-Version Update
+build-wasm: update-cache
+	@echo "🔨 Building WASM Client..."
+	cd cmd/client && GOOS=js GOARCH=wasm go build -o web/main.wasm
+	@echo "✅ WASM build complete: cmd/client/web/main.wasm"
+
+# Update Cache-Version vor dem Build
+update-cache:
+	@echo "🔄 Updating cache version..."
+	@./scripts/cache-version.sh
+
+# Build Native Client
+build-native:
+	@echo "🔨 Building Native Client..."
+	cd cmd/client && go build -o ../../build/client
+	@echo "✅ Native client build complete: build/client"
+
+# Build Server
+build-server:
+	@echo "🔨 Building Server..."
+	cd cmd/server && go build -o ../../build/server
+	@echo "✅ Server build complete: build/server"
+
+# Build All
+build-all: build-wasm build-native build-server
+
+# Clean build artifacts
+clean:
+	@echo "🧹 Cleaning build artifacts..."
+	rm -f cmd/client/web/main.wasm
+	rm -rf build/
+	@echo "✅ Clean complete"
+
+# Development: Build WASM and run local server
+dev: build-wasm
+	@echo "🚀 Starting development server..."
+	@echo "Open http://localhost:8080 in your browser"
+	cd cmd/client/web && python3 -m http.server 8080