feat: add OpenWrt cross-compilation and packaging (Phase F7)

- packaging/openwrt/: opkg Makefile, procd init script, uci config
- scripts/cross-compile.sh: build for musl targets with size checks
- .github/workflows/openwrt.yml: CI cross-compile + 5 MB size gate
- docs/openwrt.md: installation and configuration guide
- Targets: x86_64-musl, armv7-musleabihf, aarch64-musl
- Uses cargo-zigbuild for Docker-free cross-compilation
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# OpenWrt Deployment Guide
Run quicproquo on OpenWrt routers for mesh-capable, always-on encrypted messaging at the network edge.
## Supported Targets
| Target | Architecture | Common Devices |
|-----------------------------------|----------------|--------------------------|
| `x86_64-unknown-linux-musl` | x86_64 | PC Engines APU, VMs |
| `armv7-unknown-linux-musleabihf` | ARMv7 (hard-float) | RPi 2/3, many routers |
| `aarch64-unknown-linux-musl` | AArch64 | RPi 4/5, modern routers |
## Prerequisites
- Rust toolchain (stable)
- One of: `cargo-zigbuild` (recommended) or `cross`
```bash
# Install cargo-zigbuild (recommended — no Docker required)
pip3 install ziglang
cargo install cargo-zigbuild
```
## Cross-Compilation
### Quick Start
```bash
# Build for all supported targets
./scripts/cross-compile.sh
# Build for a specific target
./scripts/cross-compile.sh aarch64-unknown-linux-musl
```
### Manual Build
```bash
# Add the musl target
rustup target add x86_64-unknown-linux-musl
# Size-optimised release build
CARGO_PROFILE_RELEASE_OPT_LEVEL=s \
CARGO_PROFILE_RELEASE_LTO=true \
CARGO_PROFILE_RELEASE_CODEGEN_UNITS=1 \
CARGO_PROFILE_RELEASE_STRIP=symbols \
cargo zigbuild --release --target x86_64-unknown-linux-musl --bin qpq-server
```
The binary lands at `target/<triple>/release/qpq-server`. Target size: under 5 MB.
## OpenWrt Package Installation
### Option 1: Direct binary install (quick)
```bash
# Copy binary to router
scp target/aarch64-unknown-linux-musl/release/qpq-server root@router:/usr/bin/
# Copy init script and config
scp packaging/openwrt/files/quicproquo.init root@router:/etc/init.d/quicproquo
scp packaging/openwrt/files/quicproquo.uci root@router:/etc/config/quicproquo
# Enable and start
ssh root@router 'chmod +x /etc/init.d/quicproquo && /etc/init.d/quicproquo enable && /etc/init.d/quicproquo start'
```
### Option 2: opkg package feed
Add the feed to your OpenWrt build system:
```bash
# In your OpenWrt buildroot, add to feeds.conf:
echo "src-link quicproquo /path/to/quicproquo/packaging/openwrt" >> feeds.conf
# Update and install
./scripts/feeds update quicproquo
./scripts/feeds install quicproquo
# Select in menuconfig: Network -> quicproquo
make menuconfig
make package/quicproquo/compile V=s
```
## Configuration
The server is configured via UCI at `/etc/config/quicproquo`:
```
config server 'server'
option listen '0.0.0.0:7000'
option data_dir '/var/lib/quicproquo'
option log_level 'info'
option tls_cert '/var/lib/quicproquo/server-cert.der'
option tls_key '/var/lib/quicproquo/server-key.der'
option production '1'
```
### UCI Options
| Option | Default | Description |
|--------------|------------------------------------------|----------------------------------|
| `listen` | `0.0.0.0:7000` | QUIC listen address |
| `data_dir` | `/var/lib/quicproquo` | Persistent data directory |
| `log_level` | `info` | RUST_LOG filter |
| `tls_cert` | `<data_dir>/server-cert.der` | TLS certificate path (DER) |
| `tls_key` | `<data_dir>/server-key.der` | TLS private key path (DER) |
| `production` | `1` | Enable production hardening |
### Service Management
```bash
# Start / stop / restart
/etc/init.d/quicproquo start
/etc/init.d/quicproquo stop
/etc/init.d/quicproquo restart
# Enable at boot
/etc/init.d/quicproquo enable
# View logs
logread -e quicproquo
```
## Binary Size Optimization
The release profile is configured for minimal binary size:
| Setting | Value | Effect |
|------------------|------------|-------------------------------------|
| `opt-level` | `s` | Optimize for size over speed |
| `lto` | `true` | Full link-time optimization |
| `codegen-units` | `1` | Single codegen unit for better LTO |
| `strip` | `symbols` | Remove debug symbols |
The CI workflow enforces a 5 MB maximum binary size on every release tag.
## CI/CD
The `.github/workflows/openwrt.yml` workflow automatically:
1. Cross-compiles for all three musl targets
2. Verifies binary size stays under 5 MB
3. Uploads binaries as release artifacts
Triggered on version tags (`v*`) or manual dispatch.