Add Docker, Kubernetes configurations, and CI workflows for deployment. Integrate Gin server for API, WebSocket support, and static file hosting. Refactor WebSocket gateway to use Gin router.

Dockerfile

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+# Stage 1: Builder
+FROM golang:1.25.5-alpine AS builder
+
+# Build-Dependencies
+RUN apk add --no-cache git
+
+WORKDIR /app
+
+# Dependencies cachen
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Source Code kopieren
+COPY . .
+
+# Server binary bauen
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -ldflags="-w -s" -o server ./cmd/server
+
+# WASM Client bauen
+RUN GOOS=js GOARCH=wasm go build -o cmd/client/web/main.wasm ./cmd/client
+
+# Stage 2: Production Image
+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates curl tzdata && \
+    addgroup -g 1000 appuser && \
+    adduser -D -u 1000 -G appuser appuser
+
+WORKDIR /app
+
+# Binary und Web-Dateien vom Builder kopieren
+COPY --from=builder /app/server .
+COPY --from=builder /app/cmd/client/web ./cmd/client/web
+
+# User wechseln
+USER appuser
+
+# Port für HTTP/WebSocket
+EXPOSE 8080
+
+# Healthcheck
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD curl -f http://localhost:8080/health || exit 1
+
+CMD ["./server"]