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/zinit/zinit.conf

@@ -0,0 +1,33 @@
+# Main zinit configuration for Zero OS Alpine
+# This replaces OpenRC completely
+
+# Logging configuration
+log_level: debug
+log_file: /var/log/zinit/zinit.log
+
+# Initialization phases
+init:
+  # Phase 1: Critical system setup
+  - stage1-modules
+  - udevd
+  - depmod
+  
+  # Phase 2: Extended hardware and networking
+  - stage2-modules
+  - network
+  - lo
+  
+  # Phase 3: System services
+  - routing
+  - ntp
+  - haveged
+  
+  # Phase 4: User services
+  - sshd-setup
+  - sshd
+  - getty
+  - console
+  - gettyconsole
+
+# Service dependencies and ordering managed by individual service files
+# All services are defined in the services/ subdirectory