Implement SparkOS MVP: init system, build infrastructure, and rootfs

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

Makefile

@@ -0,0 +1,50 @@
+# SparkOS Makefile
+# Builds the minimal Linux distribution
+
+CC = gcc
+CFLAGS = -Wall -O2 -static
+DESTDIR = rootfs
+IMAGE = sparkos.img
+IMAGE_SIZE = 512M
+
+.PHONY: all clean init image help install
+
+all: init
+
+help:
+	@echo "SparkOS Build System"
+	@echo "===================="
+	@echo "Targets:"
+	@echo "  make init    - Build the init system"
+	@echo "  make install - Install init to rootfs"
+	@echo "  make image   - Create bootable dd-able image (requires root)"
+	@echo "  make clean   - Clean build artifacts"
+	@echo ""
+	@echo "Note: Creating a bootable image requires root privileges"
+	@echo "      and various tools (debootstrap, syslinux, etc.)"
+
+init: src/init.c
+	@echo "Building SparkOS init system..."
+	$(CC) $(CFLAGS) -o init src/init.c
+	@echo "Init system built successfully: ./init"
+
+install: init
+	@echo "Installing init to rootfs..."
+	install -D -m 755 init $(DESTDIR)/sbin/init
+	@echo "Init installed to $(DESTDIR)/sbin/init"
+
+image: install
+	@echo "Creating bootable image..."
+	@if [ "$$(id -u)" -ne 0 ]; then \
+		echo "ERROR: Image creation requires root privileges"; \
+		echo "Run: sudo make image"; \
+		exit 1; \
+	fi
+	@./scripts/create_image.sh
+
+clean:
+	@echo "Cleaning build artifacts..."
+	rm -f init
+	rm -f $(IMAGE)
+	rm -rf build/
+	@echo "Clean complete"