feat: Add CD workflow and Makefile

- Add deploy.yml for SSH-based deployment (only triggers on PR merge or master/main)
- Add Makefile for local build commands
- Add optimized Dockerfile (multi-stage build)

Dockerfile.new

@@ -1,52 +0,0 @@
-# Build stage
-FROM golang:1.22-alpine AS builder
-
-WORKDIR /build
-
-# Install dependencies
-RUN apk add --no-cache git ca-certificates tzdata
-
-# Copy go mod files
-COPY go.mod go.sum ./
-RUN go mod download
-
-# Copy source code
-COPY . .
-
-# Build binary
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o server ./cmd/server
-
-# Runtime stage
-FROM debian:bookworm-slim
-
-# Install runtime dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    ca-certificates \
-    tzdata \
-    && rm -rf /var/lib/apt/lists/* \
-    && apt-get clean
-
-# Create non-root user
-RUN groupadd -r app && useradd -r -g app app
-
-WORKDIR /app
-
-# Copy binary from builder
-COPY --from=builder /build/server ./carrot_bbs
-COPY --from=builder /build/configs ./configs
-
-# Set ownership
-RUN chown -R app:app /app
-
-# Switch to non-root user
-USER app
-
-# Expose ports
-EXPOSE 8080 50051
-
-# Health check
-HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
-    CMD curl -f http://localhost:8080/health || exit 1
-
-# Run the binary
-CMD ["./carrot_bbs"]