fix(agent): 画布助手 - 恢复 Skills 引用提示

web/src/components/canvas/canvas-cloud-agent-panel.tsx

@@ -745,7 +745,7 @@ export function CanvasCloudAgentPanel({ canvasId, domainProjectId, nodeCount, re
                                         disabled={Boolean(run && connectionStatus !== "connected") || !historyHydrated || !pendingHydrated}
                                         sending={busy}
                                         running={running}
-                                        placeholder={running ? "运行中可直接插话，会在它下一步生效" : agentCopy(appearance.inputPlaceholder, appearance.agentName)}
+                                        placeholder={running ? "运行中可直接插话，会在它下一步生效" : "输入操作指导；用 @ 引用画布节点，用 / 或 、 引用 Skills"}
                                         theme={theme}
                                         onPromptChange={setPrompt}
                                         onSubmit={() => void submit()}