docs: update all project documentation to reflect current codebase

- README.md: complete overhaul — project structure, architecture, env vars, test listing, Java/JDBC pipeline
- CLAUDE.md: fix field count (~28→~40), migrate Streamlit references to Vue 3, update known issues
- frontend/README.md: add missing StreamingMessage.vue and NodeProgress.vue components

frontend/README.md

@@ -22,7 +22,9 @@ src/
 ├── components/
 │   ├── Sidebar.vue          会话列表 + 下载 + 历史版本
 │   ├── ChatMessages.vue     消息列表渲染
-│   ├── ProcessSection.vue   处理过程折叠区
+│   ├── ProcessSection.vue   处理过程折叠区（<details>/<summary>）
+│   ├── StreamingMessage.vue 流式消息显示
+│   ├── NodeProgress.vue     节点进度指示器
 │   ├── UnifiedInput.vue     统一输入框（文本+文件拖拽/粘贴）
 │   ├── SummaryCard.vue      结果摘要卡片
 │   ├── KbSelector.vue       KB 下拉选择器