feat(clients): Wake-on-LAN in apple/linux/windows/android/decky

Each client learns a host's MAC from the mDNS `mac` TXT while it's awake, persists it on the saved-host record, and — when reconnecting to an offline host — sends a magic packet before connecting, plus an explicit "Wake host" action. Apple wraps the C-ABI; linux/windows call the core fn directly (linux also gains a --wake CLI mode); android via a new nativeWakeOnLan JNI export (the mDNS browse record gains a 7th mac field); decky shells out to the linux client's --wake before launching the stream.

iOS/tvOS need the managed com.apple.developer.networking.multicast entitlement (pending Apple approval), so the wake path + UI are gated off via PunktfunkConnection.wakeOnLANAvailable and the entitlement is commented out — keeping iOS/tvOS releasable. MAC-learning stays active on every platform so it lights up the moment it's ungated. macOS works today.

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

clients/windows/src/app/mod.rs

@@ -68,6 +68,9 @@ pub(crate) struct Target {
     pub(crate) port: u16,
     pub(crate) fp_hex: Option<String>,
     pub(crate) pair_optional: bool,
+    /// Wake-on-LAN MAC(s) for this host (from the saved store or the live advert) — used to send a
+    /// magic packet before connecting to an offline host. Empty when none is known.
+    pub(crate) mac: Vec<String>,
 }
 
 /// Stable app services handed to the page components as props. Each routed screen that uses