feat: implement rootless Docker with container management support

Docker Infrastructure:
- Added proper user namespace mapping in Dockerfile.alpine
- Created 'builder' user with host UID/GID mapping at build time
- Removed runtime user mapping (now handled in Dockerfile)
- Set up Rust environment for mapped user instead of root
- Fixed config mount consistency (removed :ro flags for real-time sync)

Container Management:
- Added 15 essential cgroup modules to modules-essential.list
- Complete cgroups v1 and v2 support for container orchestration
- Process control: cgroup_pids, cgroup_freezer, cgroup_cpuset
- Memory management: memcg, hugetlb_cgroup
- Network control: net_cls_cgroup, net_prio_cgroup
- Device access: cgroup_device, devices_cgroup
- Advanced features: cgroup_bpf, cgroup_perf_event, cgroup_debug

Environment Updates:
- Updated RFS Dockerfile to Alpine 3.22 for consistency
- Ensured proper /build directory permissions for mapped user

This enables true rootless operation with full container management
capabilities, fixing permission issues and enabling Zero-OS container
orchestration with complete resource control.

components/rfs/Dockerfile

@@ -11,7 +11,7 @@ RUN apt-get update && apt-get install curl build-essential libssl-dev musl-tools
 RUN rustup target add x86_64-unknown-linux-musl
 RUN cargo build --release --target=x86_64-unknown-linux-musl
 
-FROM alpine:3.19
+FROM alpine:3.22
 
 WORKDIR /app