feat: implement core Go application with web server

- Add Go modules with required dependencies (Gin, UUID, JWT, etc.)
- Implement main web server with landing page endpoint
- Add comprehensive API endpoints for health and status
- Include proper error handling and request validation
- Set up CORS middleware and security headers

output/Dockerfile.simple

@@ -0,0 +1,20 @@
+# Simple stage
+FROM golang:1.21-alpine AS builder
+
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY cmd/simple_main.go ./
+RUN go build -o simple-main simple_main.go
+
+# Final stage
+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates curl
+WORKDIR /app
+
+COPY --from=builder /app/simple-main .
+EXPOSE 8080
+
+CMD ["./simple-main"]