fix: Broken route /api/queue/manual_match in multi-edit modal

[deucebucket]

Bug

In `templates/queue.html` (~line 1222), the multi-edit modal save function calls `fetch('/api/queue/manual_match', ...)` but the actual route is `/api/manual_match` (app.py ~line 11763). Every multi-edit save attempt returns 404.

The single-edit at `queue.html:740` correctly uses `/api/manual_match`.

Fix

Change `/api/queue/manual_match` to `/api/manual_match` at queue.html line 1222.

Severity

Critical — broken feature, multi-edit is completely non-functional.

Found via UI flow audit.