fix: 防止未开始的比赛被错误标记为完成 v4.4

问题修复：
- 添加时间检查，只有已开始的比赛才能标记为完成
- 防止Liquipedia的预设比分导致未来比赛被误标为完成
- 修复了XG vs PV等未开始比赛显示完成状态的问题

技术细节：
- 在_parse_match方法中增加match_has_started检查
- 只有match_datetime <= now时才判断比赛是否完成
- 对未来比赛的比分记录debug日志但不标记为完成

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

sync_dota2_matches.py

@@ -317,7 +317,16 @@ class Dota2CalendarSync:
                     score2 = int(score_parts.group(2))
                     
                     # Check if series is completed
-                    completed = self._is_series_completed(score1, score2, format_str)
+                    # Only mark as completed if the match has already started
+                    now = datetime.now(pytz.UTC)
+                    match_has_started = match_datetime <= now
+                    
+                    if match_has_started:
+                        completed = self._is_series_completed(score1, score2, format_str)
+                    else:
+                        # Future match with score - likely a placeholder/prediction
+                        completed = False
+                        logger.debug(f"Future match {team1} vs {team2} has score {score} but not marking as completed")
                     
                     if completed:
                         winner = team1 if score1 > score2 else team2