feat(studio): 新增 Studio 工作流编辑/运行页，优化顶部三栏对齐

- 后端：项目/运行 API、上下文服务与数据模型
- 前端：Studio 列表、编辑页（R1/R2 布局）、运行页与节点图
- 编辑页顶部：CSS Grid 统一标签行与控件行对齐，项目按钮独立第三行
- Docker 开发配置与文档脚本

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/Studio/StudioContextBlockPopup.jsx

@@ -0,0 +1,33 @@
+import React from 'react';
+
+import StudioInsertionPopup from './StudioInsertionPopup';
+
+import './StudioContextBlockPopup.css';
+
+function StudioContextBlockPopup({ open, block, onClose }) {
+  if (!block) return null;
+
+  return (
+    <StudioInsertionPopup
+      open={open}
+      title={block.label}
+      defaultExpanded
+      onClose={onClose}
+    >
+      {({ expanded }) =>
+        expanded ? (
+          <pre className="studio-context-block-popup__content">
+            {block.content}
+          </pre>
+        ) : (
+          <div className="studio-context-block-popup__preview">
+            <span className="studio-insertion-popup__field-label">来源</span>
+            <span className="studio-insertion-popup__field-value">{block.source}</span>
+          </div>
+        )
+      }
+    </StudioInsertionPopup>
+  );
+}
+
+export default StudioContextBlockPopup;