feat: filter "Without German" tab to show only existing or downloading media and exclude season 0 episodes

Add is_german_review_candidate() helper function to filter media that exists locally or is currently being downloaded, excluding season 0 (specials) episodes. Apply filter to missing_german_movies and missing_german_series lists to show only actionable items. Update tab description text from "Kein deutsches Audio und keine deutschen Untertitel" to "Vorhanden oder wird gerade geladen · Staffel

app.py

@@ -179,6 +179,12 @@ def has_german_track(row):
     languages = row.get("audio_languages", []) + row.get("subtitle_languages", [])
     return any(language.get("name") == "Deutsch" for language in languages)
 
+def is_german_review_candidate(row):
+    """Only review media that exists or is currently being downloaded."""
+    if row.get("episode") and int(row.get("season") or 0) == 0:
+        return False
+    return not row.get("missing") or bool(row.get("downloading"))
+
 def media_row(name, year, media_file, remote, local, extra=None):
     path = media_file.get("path") if media_file else None
     if not path and media_file and media_file.get("relativePath"): path = str(Path(media_file.get("basePath") or "") / media_file["relativePath"])
@@ -250,10 +256,10 @@ def index():
             series = sonarr_groups()
             if any(row["pending"] for group in series for row in group["episodes"]): start_scan("sonarr")
         except Exception as exc: log.exception("Sonarr nicht erreichbar"); error = f"{error + ' | ' if error else ''}Sonarr: {exc}"
-    missing_german_movies = [row for row in rows if not has_german_track(row)]
+    missing_german_movies = [row for row in rows if is_german_review_candidate(row) and not has_german_track(row)]
     missing_german_series = []
     for group in series:
-        episodes = [episode for episode in group["episodes"] if not has_german_track(episode)]
+        episodes = [episode for episode in group["episodes"] if is_german_review_candidate(episode) and not has_german_track(episode)]
         if episodes:
             missing_german_series.append({**group, "episodes": episodes})
     return render_template("index.html", rows=rows, series=series, missing_german_movies=missing_german_movies,