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_332fdb603ffeYxhpzgAB64sSTN/prompt.txt

@@ -0,0 +1,10 @@
+https://github.com/Sagit-chu/flvx/issues/276
+计划一下这个issue实现
+
+---
+
+写出 plans/020-ajax-no-refresh-ux.md 的完整实施计划内容
+
+---
+
+开始实施