refactor: upgrade to Go 1.26 and modernize code idioms

- Replace `interface{}` with `any` type alias across all packages
- Use built-in `min()`/`max()` for parameter clamping
- Use `slices.SortFunc`, `slices.Min`, `slices.Max` for cleaner code
- Use `strings.Cut()` for simpler string parsing in auth middleware
- Use `errors.Is()` for proper error comparison in handlers
- Update dependencies: golang.org/x/image 0.37.0 -> 0.38.0
- Add Wire code generation guidelines to ARCHITECTURE.md
- Disable Go cache in CI build workflow

internal/repository/system_notification_repo.go

@@ -91,7 +91,7 @@ func (r *systemNotificationRepository) MarkAsRead(id int64, receiverID string) e
 	now := model.SystemNotification{}.UpdatedAt
 	return r.db.Model(&model.SystemNotification{}).
 		Where("id = ? AND receiver_id = ?", id, receiverID).
-		Updates(map[string]interface{}{
+		Updates(map[string]any{
 			"is_read": true,
 			"read_at": now,
 		}).Error
@@ -102,7 +102,7 @@ func (r *systemNotificationRepository) MarkAllAsRead(receiverID string) error {
 	now := model.SystemNotification{}.UpdatedAt
 	return r.db.Model(&model.SystemNotification{}).
 		Where("receiver_id = ? AND is_read = ?", receiverID, false).
-		Updates(map[string]interface{}{
+		Updates(map[string]any{
 			"is_read": true,
 			"read_at": now,
 		}).Error