feat: sync current progress (P0 hardening + P1 observability + deploy docs/systemd)

internal/model/audit_log.go

@@ -0,0 +1,14 @@
+package model
+
+import "time"
+
+type AuditLog struct {
+	ID         uint      `json:"id" gorm:"primaryKey"`
+	UserID     uint      `json:"user_id" gorm:"not null;index"`
+	EntityType string    `json:"entity_type" gorm:"size:32;not null;index"`
+	EntityID   uint      `json:"entity_id" gorm:"not null;index"`
+	Action     string    `json:"action" gorm:"size:16;not null;index"`
+	BeforeJSON string    `json:"before_json" gorm:"type:text"`
+	AfterJSON  string    `json:"after_json" gorm:"type:text"`
+	CreatedAt  time.Time `json:"created_at"`
+}