feat: connect inbox confirmation workflow

backend/internal/models/inbox_suggestion.go

@@ -0,0 +1,21 @@
+package models
+
+import "time"
+
+// SenlinAgentInboxSuggestion 保存分析阶段的候选草稿；它不是任务、笔记或资料，只有用户确认后才会创建正式对象。
+type SenlinAgentInboxSuggestion struct {
+	ID                uint   `gorm:"primaryKey"`
+	Identity          string `gorm:"type:char(36);uniqueIndex"`
+	InboxItemID       uint   `gorm:"index;not null"`
+	InboxItemIdentity string `gorm:"type:char(36);index"`
+	CreatedBy         uint   `gorm:"index;not null"`
+	CreatedByIdentity string `gorm:"type:char(36);index"`
+	Kind              string `gorm:"not null"`
+	Title             string `gorm:"not null"`
+	Body              string `gorm:"type:text"`
+	CreatedAt         time.Time
+}
+
+func (SenlinAgentInboxSuggestion) TableName() string {
+	return "senlin_agent_inbox_suggestions"
+}