Add basic Golang Makefile with test, run, build, and release targets

[Copilot]

This PR implements a comprehensive Golang build system for the futures_engine project with the requested Makefile targets.

What's Added

Core Makefile Targets

• make test - Runs all tests with verbose output
• make run - Runs the application directly without building
• make build - Builds a single binary for the current platform
• make release - Creates cross-platform release builds for:
  • Linux (AMD64, ARM64)
  • Windows (AMD64)
  • macOS (AMD64, ARM64/Apple Silicon)

Additional Development Targets

• make test-coverage - Generates test coverage reports
• make clean - Removes build artifacts
• make deps - Installs and tidies dependencies
• make fmt - Formats Go code
• make lint - Lints code (uses golangci-lint if available, falls back to go vet)
• make check - Runs format, lint, and test in sequence
• make dev - Development mode with file watching (if air is installed)
• make help - Shows all available targets

Project Structure

Since this was a fresh repository, I've also added:

• Go module initialization (go.mod)
• Basic application structure (main.go) with a futures engine framework
• Unit tests (main_test.go) to validate the build system
• Updated .gitignore to exclude build artifacts

Usage Examples

# Run tests
make test

# Run the application
make run

# Build for current platform
make build

# Create release builds for all platforms
make release

# Show all available targets
make help

The Makefile uses semantic versioning from git tags and includes proper LDFLAGS for version injection into the binary.

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