feat(analyst): Introduce interpret functionality and enhance chat API

- Added `interpret` flag to `AnalystChatRequest` for optional immediate interpretation of queries.
- Implemented new `POST /api/analyst/interpret` endpoint for on-demand data interpretation based on the latest query snapshot.
- Updated `AnalystAgent` to handle interpretation logic, including error handling and response formatting.
- Enhanced `AnalystQueryPage` to include a button for triggering interpretations, improving user interaction.
- Updated frontend API calls to support the new interpret functionality, ensuring seamless integration with existing workflows.

This update significantly enhances the analytical capabilities of the application, allowing users to request interpretations of their queries directly.

docs/memory/ITERATION.md

@@ -30,5 +30,5 @@
 | 2026-09-10 | **前端 E2E 问题清单收口**：`AuthProvider` 修登录崩溃/退出死循环 · Redis `socket_connect_timeout` 0.5s · 预警筛选防抖 · I18N formatter · 对话 Markdown 粗体 · A11Y `index.html` · AntD `<App>` | `docs/整体测试/前端整体测试交接.md` 登记项 | web · `database.py` · MEMORY |
 | 2026-09-10 | **答辩/课程**：`docs/答辩/答辩知识点清单.md` · 总览模块 8 · 问数课 D-06 模块 5 · 导览中心更新 | 用户答辩准备 | docs/course · MEMORY |
 | 2026-09-10 | **客服问候修复**：「你好」关键词 → `chit_chat` · LLM 失败 `CHITCHAT_DEGRADED_TEXT`（非 FALLBACK）· 游客问候快路由 | 用户反馈 Chat 无法回答问候 | customer_prompts · customer_service · visitor · tests |
-| 2026-09-10 | **产品口径落账**：Redis≠Dashboard 缓存 · 四角色 home 有图无 BI · 客户趋势=问数 self 域非 Chat 曲线（§9.6） | 用户问答澄清 | MEMORY §0/§3 · TODO §2026-09-11 · FRONTEND-HANDOFF §10 |
+| 2026-09-11 | **D-09 子集 · 问数/解读拆分**：`interpret=false` 默认 · `POST /api/analyst/interpret` · 问数页按钮 · MEMORY/TODO/REQUIREMENTS · **813 pytest** | 用户：合并进 memory + 各角色「分析该数据」 | analyst_agent / analyst.py / AnalystQueryPage |
 | 2026-09-10 | **TODO 日终清单 + 优化 TODO 补全**：硬伤盘点落账 · 2026-09-10 已完成/进行中/将要做 | 用户要求 | TODO · ITERATION |