feat: 季节月份自动赋值 + 节点 description 详情季节动态覆盖 (PR #2295/#2296/#2301)
A. 季节月份自动 (PR #2295, Closes #2291): SaveRequest 删 monthStart/monthEnd,
后端按 seasonType 自动赋 (spring 3-5 / summer 6-8 / autumn 9-11 / winter 12-2)
B. 节点 description 季节动态覆盖 (PR #2296+#2301, Closes #2293+#2298):
admin/mp/internal 三路径详情装配时, seasonHighlights 非空 → 覆盖 description
节点表 DB 字段保留不动 (用户手填永久存)
前端 mmg 删 SeasonDrawer 月份选择器即可。节点 description 字段名不变, 零前端改动。
notify @mmg
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>