feat(tree): checkpoint resource lifecycle work

提交当前顶层 mnote Git 工作区，范围集中在 04-tree-domain 的 resource/trash/filetree 生命周期、mnote-web resource_trash 路由、Convex/Next 兼容接口、sidebar/file-tree 客户端适配、smoke 脚本与对应设计/bug 记录。

不包含被 ignore 的 design/05-editor-mainline/reference-code/leptos-tiptap 嵌套仓库改动。新增 smoke 的测试密码改为运行时读取 MNOTE_E2E_PASSWORD，避免提交明文 credential assignment。

wolai-frontend/src/lib/file-tree/clipboard.ts

@@ -3,7 +3,7 @@
 import type { FileTreeRow } from "./types";
 import { parseFileTreeRowId } from "./types";
 
-export type FileTreeClipboardAction = "copy";
+export type FileTreeClipboardAction = "copy" | "cut";
 
 export type FileTreeClipboardPayloadV1 = {
   type: "mnote-file-tree";
@@ -45,7 +45,7 @@ export function decodeFileTreeClipboardPayload(text: string): FileTreeClipboardP
     const raw = decodeBase64(base64);
     const parsed = JSON.parse(raw) as Partial<FileTreeClipboardPayloadV1>;
     if (parsed?.type !== "mnote-file-tree" || parsed.version !== 1) return null;
-    if (parsed.action !== "copy") return null;
+    if (parsed.action !== "copy" && parsed.action !== "cut") return null;
     if (!Array.isArray(parsed.rowIds) || parsed.rowIds.some((id) => typeof id !== "string")) return null;
     return parsed as FileTreeClipboardPayloadV1;
   } catch {
@@ -78,6 +78,17 @@ export async function readFileTreeClipboardPayload(): Promise<FileTreeClipboardP
   return decodeFileTreeClipboardPayload(text);
 }
 
+export async function clearFileTreeClipboardPayload(): Promise<void> {
+  memoryClipboardText = null;
+  if (typeof navigator !== "undefined" && navigator.clipboard?.writeText) {
+    try {
+      await navigator.clipboard.writeText("");
+    } catch {
+      // ignore, memory fallback 已清空
+    }
+  }
+}
+
 export function isTextInputTarget(target: EventTarget | null): boolean {
   const el = target as HTMLElement | null;
   if (!el) return false;