feat(server): route URL/playlist /fetch to download jobs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/app.py

@@ -51,6 +51,21 @@ def fetch(q: str = Query(..., min_length=1),
           source: str = Query("auto")):
     if quality not in mf.QUALITY_CHOICES:
         raise HTTPException(status_code=422, detail=f"Invalid quality '{quality}'.")
+
+    if mf.is_url(q):
+        kind = "playlist" if mf.is_playlist_url(q) else "track"
+        syn = mf.Hit(source="youtube", kind=kind, title="", artist="")
+        job = jobs.create_job(hit=syn, message=actions.url_started_message(kind))
+        response = _job_public(job)
+        done_msg = actions.playlist_done_message if kind == "playlist" else actions.url_done_message
+        jobs.run_job(
+            job.id,
+            lambda: actions.perform_url_fetch(q, quality, ROOT),
+            done_message=done_msg,
+            fail_message="Download failed.",
+        )
+        return response
+
     if source not in ("auto", "lidarr", "youtube"):
         raise HTTPException(status_code=422, detail=f"Invalid source '{source}'.")