feat: initialize Ballet Island 微信小程序 with basic structure and functionality

- Add project configuration for WeChat mini program.
- Create skills lock file for Taroify integration.
- Set up app configuration and styles.
- Implement main app component and index page with welcome message.
- Add health check service to verify backend readiness.
- Configure TypeScript settings and global types.

backend/Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:1.26-alpine AS builder
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /out/api ./cmd/server
+
+FROM alpine:3.23
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /out/api /usr/local/bin/api
+USER 65532:65532
+EXPOSE 8080
+ENTRYPOINT ["/usr/local/bin/api"]
+