Initial commit: Modular personal toolbox with high-fidelity Chinese stroke order tool and CI/CD

Dockerfile

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+# --- Build Stage ---
+FROM golang:1.25-alpine AS builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apk add --no-cache git
+
+# Download dependencies
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source and data
+COPY cmd/ ./cmd/
+COPY pkg/ ./pkg/
+
+# Build the binary
+RUN CGO_ENABLED=0 GOOS=linux go build -o /toolbox cmd/toolbox/main.go
+
+# --- Final Stage ---
+FROM alpine:latest
+
+# Basic security & CA certs
+RUN apk --no-cache add ca-certificates tzdata
+WORKDIR /root/
+
+# Copy binary from builder
+COPY --from=builder /toolbox .
+
+# Default environment
+ENV PORT=8080
+EXPOSE 8080
+
+CMD ["./toolbox"]