feat(quick-wins): HF-Link-Suche, Download-ETA, Job-Verlauf loeschbar

- Cookbook-Profisuche: ganze HF-URL oder "owner/repo" direkt einfuegbar
  (parseHfRepo) -> exakter Treffer statt unscharfer Suche; limit 12->40,
  damit auch grosse/seltenere Modelle (z.B. Llama-4-Scout) erscheinen.
- jobengine.attach_download_progress: geglaettete Rate (EMA) + Restzeit
  (eta_s) je Download; Aktivitaet zeigt "noch ~X min · Y MB/s".
- Jobs: erledigte/abgebrochene Eintraege einzeln loeschbar (DELETE
  /api/jobs/{id}) + "Verlauf leeren" (POST /api/jobs/clear); laufende
  bleiben geschuetzt.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

jobengine.py

@@ -113,9 +113,12 @@ def attach_download_progress(job_id: str, local_dir: str, total_bytes: int) -> N
     job = JOBS.get(job_id)
     if job is not None:
         job["progress"] = 0
+        job["total_bytes"] = total_bytes
 
     def _watch():
         pat = os.path.join(local_dir, ".cache", "huggingface", "download", "*.incomplete")
+        prev_t, prev_b = None, None
+        rate = 0.0  # geglaettete Download-Rate (Bytes/s), EMA gegen Zappeln
         while True:
             j = JOBS.get(job_id)
             if not j or j["state"] in ("done", "failed", "canceled"):
@@ -125,12 +128,22 @@ def attach_download_progress(job_id: str, local_dir: str, total_bytes: int) -> N
                 cur = sum(os.path.getsize(f) for f in inc) if inc else 0
                 if cur:
                     j["progress"] = min(99, int(cur * 100 / total_bytes))
+                    j["done_bytes"] = cur
+                    now = time.time()
+                    if prev_t is not None and now > prev_t and cur >= prev_b:
+                        inst = (cur - prev_b) / (now - prev_t)
+                        rate = inst if rate == 0 else 0.3 * inst + 0.7 * rate
+                        if rate > 0:
+                            j["rate_bps"] = rate
+                            j["eta_s"] = int((total_bytes - cur) / rate)
+                    prev_t, prev_b = now, cur
             except Exception:  # noqa: BLE001
                 pass
             time.sleep(1.0)
         j = JOBS.get(job_id)
         if j and j["state"] == "done":
             j["progress"] = 100
+            j.pop("eta_s", None)
 
     threading.Thread(target=_watch, daemon=True).start()
 
@@ -156,6 +169,25 @@ def cancel_job(job_id: str) -> bool:
     return True
 
 
+def delete_job(job_id: str) -> bool:
+    """Einen abgeschlossenen Job aus dem Verlauf entfernen. Laufende Jobs werden
+    NICHT geloescht (erst abbrechen). Liefert False, wenn unbekannt oder noch aktiv."""
+    job = JOBS.get(job_id)
+    if not job or job["state"] not in ("done", "failed", "canceled"):
+        return False
+    JOBS.pop(job_id, None)
+    return True
+
+
+def clear_finished() -> int:
+    """Alle abgeschlossenen Jobs (fertig/fehler/abgebrochen) aus dem Verlauf raeumen.
+    Laufende bleiben. Liefert die Anzahl entfernter Eintraege."""
+    done = [jid for jid, j in JOBS.items() if j["state"] in ("done", "failed", "canceled")]
+    for jid in done:
+        JOBS.pop(jid, None)
+    return len(done)
+
+
 def start_job(args: list[str], label: str, env: dict | None = None,
               stdin_data: str | None = None, log_cmd: str | None = None) -> str:
     job_id = uuid.uuid4().hex[:12]