v0.5.71: matches tab, streamer viewport video load, matchup cross-check.

Add pro watchlist matches page; load streamer clips by viewport tier with posters; harden STRATZ matchup refresh and OpenDota cross hints.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/data/streamers.json

@@ -215,6 +215,24 @@
       "is_live": false,
       "live_probed_at": "2026-07-29T05:14:20.319003+00:00"
     },
+    {
+      "id": "leize",
+      "platform": "douyin",
+      "profile_url": "https://v.douyin.com/bxYZijBybSE/",
+      "heroes": [
+        "razor"
+      ],
+      "nickname": "卡奥兹Khs",
+      "unique_id": "Khaos995",
+      "signature": "万分核心｜战斗C位｜顶级心态 上车/打号：Khaos…",
+      "following_count": 90,
+      "follower_count": 2921,
+      "total_favorited": 46000,
+      "avatar": "streamer_avatars/leize.jpg",
+      "video": "streamer_videos/leize.mp4",
+      "video_title": "POS 1 雷泽全新分享 · 雷霆爆轰征服天梯",
+      "profile_fetched_at": "2026-07-29T07:20:00+00:00"
+    },
     {
       "id": "shawang",
       "platform": "bilibili",