Version: 0.7.2.dev.260322

feat(schedule-plan): ✨ 重构智能排程链路并修复粗排双节对齐问题

- ✨ 新增“对话级排程状态持久化”能力：引入 `agent_schedule_states` 模型/DAO，并接入启动迁移
- ✨ 智能排程图升级：补齐小幅微调（quick refine）分支，完善预算/并发/状态字段流转
- ✨ 预览链路增强：完善排程预览服务读写与桥接逻辑，新增本地预览页 `infra/schedule_preview_viewer.html`
- ♻️ 缓存治理统一：将相关缓存处理收口到 DAO + `cache_deleter` 联动清理，移除旧散落逻辑
- 🐛 修复粗排核心 bug：禁止单节降级，强制双节并按 `1-2/3-4/...` 对齐；修复结束日扫描边界问题
- ✅ 新增粗排回归测试：覆盖孤立单节、偶数起点双节、Filler 对齐等关键场景

backend/cmd/start.go

@@ -98,7 +98,7 @@ func Start() {
 	courseService := service.NewCourseService(courseRepo, scheduleRepo)
 	taskClassService := service.NewTaskClassService(taskClassRepo, cacheRepo, scheduleRepo, manager)
 	scheduleService := service.NewScheduleService(scheduleRepo, userRepo, taskClassRepo, manager, cacheRepo)
-	agentService := service.NewAgentServiceWithSchedule(aiHub, agentRepo, taskRepo, agentCacheRepo, eventBus, scheduleService)
+	agentService := service.NewAgentServiceWithSchedule(aiHub, agentRepo, taskRepo, cacheRepo, agentCacheRepo, eventBus, scheduleService)
 
 	// API 层初始化。
 	userApi := api.NewUserHandler(userService)