feat(packaging): Fedora/Bazzite packaging — COPR RPM, bootc image, gamescope-default config

Roadmap #3 (install on other devices). Bazzite already ships gamescope + PipeWire + the
NVIDIA stack, so the host slots in with minimal new deps (ffmpeg-libs from RPM Fusion + opus
+ libei).

- packaging/rpm/punktfunk.spec — builds punktfunk-host from source (cargo), installs the
  binary + udev rule + systemd user unit + headless helpers; Requires/Recommends mapped from
  the Ubuntu bootstrap deps to Fedora.
- packaging/bootc/Containerfile — layer punktfunk into a bazzite-nvidia bootc image for
  atomic, image-based installs.
- packaging/bazzite/host.env — gamescope-default appliance config (spawned per session).
- packaging/copr/ + packaging/README.md — COPR build-from-SCM settings + install docs
  (rpm-ostree and bootc paths), and why not Flatpak.
- LICENSE-MIT + LICENSE-APACHE — materialize the declared `MIT OR Apache-2.0` (was unfiled);
  the RPM ships them.

Not buildable on the Ubuntu dev box (no rpm tooling) — the COPR/Fedora build is operator-run;
all spec-referenced files verified present and the cargo build is green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packaging/copr/README.md

@@ -0,0 +1,35 @@
+# COPR build-from-SCM settings
+
+COPR builds the RPM from this git repo (no manual SRPM upload). Configure the project
+once in the COPR web UI (or with `copr-cli`):
+
+**Project → New Build → SCM**
+- Clone URL:      `https://git.unom.io/unom/punktfunk`
+- Committish:     `main` (or a release tag)
+- Subdirectory:   *(repo root)*
+- Spec File:      `packaging/rpm/punktfunk.spec`
+- Source build method: `rpkg` (or `make_srpm`)
+
+**Project settings**
+- Chroots: `fedora-41-x86_64`, `fedora-42-x86_64` (match your Bazzite Fedora base;
+  `rpm -E %fedora` on the host tells you which). Add `aarch64` if needed.
+- External repositories (so `ffmpeg-devel` resolves at build time):
+  `https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$releasever.noarch.rpm`
+  and the matching `-free-` repo.
+- Enable network during build (cargo fetches crates from crates.io) — COPR allows this by
+  default.
+
+`copr-cli` equivalent:
+
+```sh
+copr-cli create punktfunk --chroot fedora-42-x86_64 \
+  --repo 'https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-$releasever.noarch.rpm' \
+  --repo 'https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$releasever.noarch.rpm'
+copr-cli buildscm punktfunk \
+  --clone-url https://git.unom.io/unom/punktfunk \
+  --commit main --spec packaging/rpm/punktfunk.spec --method rpkg
+```
+
+Note: COPR caps build time/RAM; a full `cargo build --release` of the host (FFmpeg/PipeWire
+sys-crates + aws-lc-rs) is heavy but within the default COPR limits. If a chroot OOMs, lower
+parallelism with `CARGO_BUILD_JOBS` in the spec's `%build`.