🔧 Fix blueonyx build scripts and add CLAUDE.md + PLAN.md 🔧

Fix two build-breaking issues in setup scripts and update BUILD_DATE.
Add repo documentation files.
- Dockerfile: update BUILD_DATE from 202509161146 to 202605131434
- rootfs/root/docker/setup/02-packages.sh: remove broken reboot and sudo dnf commands that abort Docker build; BlueOnyx installation is done in 05-custom.sh
- rootfs/root/docker/setup/03-files.sh: remove irrelevant incus binary download from GitHub (fails in buildx sandbox; unrelated to BlueOnyx)
- CLAUDE.md: new file documenting systemd-container architecture, build notes, runtime requirements, and env vars
- PLAN.md: new file documenting migration steps, build command, smoke test procedure

CLAUDE.md
Dockerfile
PLAN.md
rootfs/root/docker/setup/02-packages.sh
rootfs/root/docker/setup/03-files.sh

PLAN.md

@@ -0,0 +1,48 @@
+# blueonyx Migration Plan
+
+## Status: In Progress
+
+## Architecture decision
+BlueOnyx is a full RHEL-based server control panel that requires systemd.
+- Base: `almalinux/10-init` (systemd-enabled AlmaLinux 10)
+- Single-stage build (no FROM scratch stripping)
+- CMD: `/sbin/init` (systemd as PID 1)
+- No tini entrypoint; no init.d framework
+- amd64 only
+
+## Steps
+
+- [x] Read existing Dockerfile and all setup scripts
+- [x] Identify and fix `02-packages.sh` (remove `reboot`, `sudo dnf` lines)
+- [x] Identify and fix `03-files.sh` (remove irrelevant incus download)
+- [x] Update BUILD_DATE
+- [x] Create CLAUDE.md
+- [ ] Build image (`docker buildx build --platform linux/amd64`)
+- [ ] Smoke test (container starts, systemd runs, web UI reachable on port 444)
+- [ ] Commit and push
+
+## Build command
+```bash
+cd /root/Projects/github/casjaysdevdocker/blueonyx
+docker buildx --builder blueonyx build \
+  --platform linux/amd64 \
+  --tag casjaysdevdocker/blueonyx:latest \
+  --push .
+```
+
+## Smoke test
+```bash
+docker run -d --privileged \
+  -v /sys/fs/cgroup:/sys/fs/cgroup:rw \
+  -p 10444:444 -p 10081:81 \
+  --name test-blueonyx \
+  casjaysdevdocker/blueonyx:latest
+# Wait 30s, check systemd is running
+docker exec test-blueonyx systemctl status 2>/dev/null | head -5
+docker rm -f test-blueonyx
+```
+
+## Known limitations
+- Build takes 20-40 minutes (900-1200 RPMs from BlueOnyx + AlmaLinux repos)
+- `initServices.sh` may warn during build (no systemd at build time) — expected
+- Runtime requires `--privileged` and cgroup v2 mount