feat: Implement complete Zero OS Alpine Initramfs Builder

- Complete bash framework with strict error handling
- Modular library system (docker, alpine, components, initramfs, kernel, testing)
- Rust component integration (zinit, rfs, mycelium) with musl targeting
- Rootless Docker/Podman support for GitHub Actions
- Centralized configuration in config/build.conf
- 2-stage module loading system
- Strip + UPX optimization for minimal size
- Complete zinit integration replacing OpenRC
- GitHub Actions CI/CD pipeline
- Comprehensive documentation and usage guides

Components:
- Latest stable kernel 6.12.44
- Alpine Linux 3.22 base
- ThreeFold components: zinit, mycelium, rfs, corex
- Target: ~8-12MB final initramfs.cpio.xz

config/packages.list

@@ -0,0 +1,46 @@
+# Alpine packages for Zero-OS embedded initramfs
+# Based on existing configs/packages-minimal.txt
+# Target: ~50MB total (not 700MB!)
+
+# Core system (essential only)
+alpine-baselayout
+busybox
+musl
+
+# Module loading & hardware detection
+eudev
+eudev-hwids
+eudev-libs
+eudev-netifnames
+kmod
+
+# Console/terminal management
+util-linux
+
+# Essential networking (for Zero-OS connectivity)
+iproute2
+ethtool
+
+# Filesystem support (minimal)
+btrfs-progs
+dosfstools
+
+# Essential libraries only
+zlib
+
+# Network utilities (minimal)
+dhcpcd
+tcpdump
+bmon
+
+# Random number generation (for crypto/security)
+haveged
+
+# SSH access and terminal multiplexer
+openssh-server
+zellij
+
+# Essential debugging and monitoring tools included
+# NO development tools, NO curl/wget, NO python, NO redis
+# NO massive linux-firmware package
+# Other tools will be loaded from RFS after network connectivity