Phase 5: Add Neo4j graph analysis frontend panel

- Add graph analysis sidebar button and panel UI in workbench.html
- Implement graph statistics display (nodes, edges, density, components)
- Implement centrality analysis ranking display
- Implement community detection visualization using D3.js force layout
- Implement shortest path query and visualization
- Implement neighbor node query and visualization
- Add Neo4j connection status indicator
- Add data sync to Neo4j functionality
- Update STATUS.md marking frontend graph panel as completed
- Style consistent with dark theme using #00d4ff as primary color

STATUS.md

@@ -146,9 +146,16 @@ Phase 5: 高级功能 - **进行中 🚧**
   - `GET /api/v1/projects/{id}/graph/communities` - 社区发现
   - `POST /api/v1/graph/subgraph` - 子图提取
 - [x] 部署 Neo4j 服务 (docker-compose)
-- [ ] 前端图分析面板
-- [ ] 路径可视化
-- [ ] 社区可视化
+- [x] 前端图分析面板
+  - 图统计信息展示（节点数、边数、密度、连通分量）
+  - 度中心性排名展示
+  - 社区发现可视化（D3.js 力导向图）
+  - 最短路径查询和可视化
+  - 邻居节点查询和可视化
+  - Neo4j 连接状态指示
+  - 数据同步按钮
+- [ ] 路径可视化优化
+- [ ] 社区可视化增强
 
 ### Phase 4 - Neo4j 集成 (可选)
 - [ ] 将图谱数据同步到 Neo4j