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/syncthing/process_other.go

@@ -0,0 +1,14 @@
+//go:build !windows
+
+package syncthing
+
+import "os/exec"
+
+// createSyncthingCmd creates the Syncthing command on Unix.
+func createSyncthingCmd() *exec.Cmd {
+	path := findSyncthing()
+	if path == "" {
+		return nil
+	}
+	return exec.Command(path, "-no-browser", "-no-restart")
+}