feat: node management enhancements and UX improvements (#297)

* feat(nodes): add renewal cycle and auto-advance scheduling

- Add renewal_cycle field to nodes for tracking paid vs free cycles
- Implement auto-advance scheduling when renewal is processed
- Add migration test for renewal_cycle column
- Update dashboard to show renewal cycle count
- Add renewal status display on node detail page

* fix(frontend): show rule count in compact view mode for forward pages

* style(frontend): format code and improve node card layout

Entire-Checkpoint: 08b760b76538

* fix: restore renewal.ts from main to resolve build errors

.entire/metadata/ses_332d83689ffeJ93gRXNEEeOpSm/summary.txt

@@ -0,0 +1,8 @@
+已完成！
+
+**提交摘要：**
+- 10 个文件变更（939 行新增，173 行删除）
+- 新增计划文档 `plans/020-ajax-no-refresh-ux.md`
+- 新增工具函数 `vite-frontend/src/utils/list-state.ts`
+
+**PR 已创建：** https://github.com/Sagit-chu/flvx/pull/293