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/monitor/folders.go

@@ -0,0 +1,60 @@
+package monitor
+
+import (
+	"sync"
+
+	st "git.davoryn.de/calic/syncwarden/internal/syncthing"
+)
+
+// FolderTracker tracks per-folder status.
+type FolderTracker struct {
+	mu      sync.Mutex
+	folders []FolderInfo
+}
+
+// NewFolderTracker creates a new folder tracker.
+func NewFolderTracker() *FolderTracker {
+	return &FolderTracker{}
+}
+
+// UpdateFromConfig sets the folder list from Syncthing config.
+func (ft *FolderTracker) UpdateFromConfig(folders []st.FolderConfig) {
+	ft.mu.Lock()
+	defer ft.mu.Unlock()
+
+	ft.folders = make([]FolderInfo, len(folders))
+	for i, f := range folders {
+		ft.folders[i] = FolderInfo{
+			ID:    f.ID,
+			Label: f.Label,
+			Path:  f.Path,
+			State: "unknown",
+		}
+		if f.Label == "" {
+			ft.folders[i].Label = f.ID
+		}
+	}
+}
+
+// UpdateStatus updates the state for a specific folder.
+func (ft *FolderTracker) UpdateStatus(folderID, state string) {
+	ft.mu.Lock()
+	defer ft.mu.Unlock()
+
+	for i := range ft.folders {
+		if ft.folders[i].ID == folderID {
+			ft.folders[i].State = state
+			return
+		}
+	}
+}
+
+// Folders returns a snapshot of all folder info.
+func (ft *FolderTracker) Folders() []FolderInfo {
+	ft.mu.Lock()
+	defer ft.mu.Unlock()
+
+	out := make([]FolderInfo, len(ft.folders))
+	copy(out, ft.folders)
+	return out
+}