feat(report): 报告生成端到端 — 规划→分章并行检索撰写→渲染真实 Word

- shared: 新增 intent=report 任务约定 + ReportPath（跨进程共享落盘目录，零配置对齐）
- dispatcher: handleReport 专用编排（DeepSeek 规划大纲 → 各章并行 RAG 检索+撰写
  → 汇聚 → report_render），Pool.Chat 非流式聚合；进度与正文经 Token 流实时回流
- mcp-go: 用标准库 archive/zip + OOXML 拼出真实可打开的 .docx（零额外依赖），
  report_render 工具落盘到共享目录；附 docx 有效性测试
- gateway: POST /reports 触发；GET /reports/:id/download 下发 Word
- desktop: 新增「报告」页（主题→实时编排进度→下载 Word），左导航置为就绪

实测：DeepSeek 生成 5 章报告 → 渲染 5KB docx → file 识别为 Microsoft Word 2007+
→ textutil 提取标题/各章正文完整。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-desktop/frontend/src/shell/LeftNav.tsx

@@ -20,7 +20,7 @@ const ITEMS: Item[] = [
   { key: "home", label: "工作台", icon: "▤", ready: true },
   { key: "studio", label: "编排", icon: "◆", group: "BUILD", ready: true },
   { key: "kb", label: "知识库", icon: "▣", group: "BUILD", ready: true },
-  { key: "report", label: "报告", icon: "▦", group: "BUILD" },
+  { key: "report", label: "报告", icon: "▦", group: "BUILD", ready: true },
   { key: "runs", label: "运行", icon: "▸", group: "RUN" },
   { key: "memory", label: "记忆", icon: "◇", group: "MANAGE", ready: true },
   { key: "market", label: "市场", icon: "⌧", group: "MANAGE" },