Implement SyncWarden v0.1.0

Full Syncthing tray wrapper with:
- System tray with 5 icon states (idle/syncing/paused/error/disconnected)
- Syncthing REST API client with auto-discovered API key
- Long-polling event listener for real-time status
- Transfer rate monitoring, folder tracking, recent files, conflict counting
- Full context menu with folders, recent files, settings toggles
- Embedded admin panel binary (webview, requires CGO)
- OS notifications via beeep (per-event configurable)
- Syncthing process management with auto-restart
- Cross-platform installer with autostart
- CI pipeline for Linux (.deb + .tar.gz) and Windows (.zip)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/notify/notify.go

@@ -0,0 +1,41 @@
+package notify
+
+import (
+	"log"
+
+	"github.com/gen2brain/beeep"
+)
+
+const appName = "SyncWarden"
+
+// Send sends an OS notification.
+func Send(title, message string) {
+	if err := beeep.Notify(title, message, ""); err != nil {
+		log.Printf("notification error: %v", err)
+	}
+}
+
+// SyncComplete notifies that a folder finished syncing.
+func SyncComplete(folder string) {
+	Send(appName, folder+" finished syncing")
+}
+
+// DeviceConnected notifies that a device connected.
+func DeviceConnected(name string) {
+	Send(appName, name+" connected")
+}
+
+// DeviceDisconnected notifies that a device disconnected.
+func DeviceDisconnected(name string) {
+	Send(appName, name+" disconnected")
+}
+
+// NewDevice notifies about a new device request.
+func NewDevice(name string) {
+	Send(appName, "New device wants to connect: "+name)
+}
+
+// Conflict notifies about a sync conflict.
+func Conflict(file, folder string) {
+	Send(appName, "Conflict: "+file+" in "+folder)
+}