Add 4.1.4 planning doc and release notes

PLAN-4.1.4.md

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+# Stegasoo 4.1.4 Plan
+
+## Build / Deploy
+- [ ] Pre-built Python 3.12 venv tarball for Pi (skip 20+ min compile)
+- [ ] Fixed partition sizing in flash script (8-16GB rootfs for faster imaging)
+- [ ] Rename `flash-pi.sh` → `flash-stock-img.sh` for clarity
+- [ ] pip-audit integration in release validation
+
+## Features
+- [ ] QR channel key sharing (needs UI thought - avoid crowding encode/decode pages)
+- [ ] Role-based permissions: admin / mod / user
+- [ ] `stegasoo info` fastfetch-style command (version, service status, channel, CPU, temp, etc.)
+- [ ] Better capacity estimates / pre-flight check before encode fails
+
+## Security
+- [ ] Optional encryption for temp file storage (paranoid mode, config toggle)
+
+## Docs
+- [ ] Update UNDER_THE_HOOD.md
+- [ ] General docs refresh
+
+## Ideas (maybe later)
+- [ ] Stego detection tool
+- [ ] Browser extension
+- [ ] Pi snapshot/backup feature