refactor(mediabunny): [PKG-MB-03] type inputs and cancel owned loads

refactor/tasks.json

@@ -3439,11 +3439,14 @@
         "PKG-MB-02",
         "CORE-09"
       ],
-      "status": "todo",
+      "status": "done",
       "risk": "H",
       "deliverable": "input.js 源检测、输入资源、Range 与取消",
       "acceptance": "HLS 检测在 input 边界，旧来源类型和超时保持",
-      "evidence": []
+      "evidence": [
+        "changes/2026-09-12-PKG-MB-03-input.md",
+        "baselines/mb-input-validation.json"
+      ]
     },
     {
       "id": "PKG-MB-04",