feat: sync FileBrowser config on startup

Ensures config.yaml and docker-compose.yml are regenerated on
controller startup, so new drives added while the controller was
down still get their FileBrowser sources configured.

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

controller/internal/web/server.go

@@ -73,6 +73,9 @@ func NewServer(cfg *config.Config, stackMgr *stacks.Manager, cpuCollector *syste
 		logger.Printf("[INFO] Auth: no password configured — dashboard is open")
 	}
 
+	// Sync FileBrowser config on startup to ensure mounts and sources are current
+	go s.syncFileBrowserMounts()
+
 	return s
 }