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

templates/index.html

@@ -17,7 +17,7 @@
 {% if sonarr_enabled %}<section id="sonarr" class="view" data-source="sonarr"><div class="stats"><span class="stat" id="seriesCount">{{ series|length }} Serien</span><span class="stat scan" id="sonarrStatus">Scan wird vorbereitet …</span><span class="stat">Dashboard: {{ local_series_path }}</span></div><div class="tablewrap" id="seriesList">
 {% for group in series %}<details class="series" open><summary>{{ group.title }} <span class="muted">({{ group.year or '—' }}) · {{ group.episodes|length }} Episoden</span></summary><table><thead><tr><th class="col-title">Episode</th><th class="col-quality">Quality</th><th class="col-state">Status</th><th class="col-audio">Audio</th><th class="col-subs">Untertitel</th><th class="col-video">Video</th><th class="col-size">Größe</th></tr></thead><tbody>{% for r in group.episodes %}<tr><td><span class="title">{{ r.title }}</span></td><td><span class="badge {% if not r.missing %}quality{% endif %}">{{ r.quality }}</span></td><td><span class="state {{ r.state.class }}">{{ r.state.label }}</span></td><td><div class="badges">{% for l in r.audio_languages %}<span class="badge">{{ l.flag }} {{ l.name }}</span>{% else %}<span class="muted">—</span>{% endfor %}</div></td><td><div class="badges">{% for l in r.subtitle_languages %}<span class="badge">{{ l.flag }} {{ l.name }}</span>{% else %}<span class="muted">—</span>{% endfor %}</div></td><td>{{ r.video_codec }}</td><td>{{ r.size }}</td></tr>{% endfor %}</tbody></table></details>{% endfor %}
 </div></section>{% endif %}
-<section id="missing" class="view" data-source="radarr"><div class="stats"><span class="stat" id="missingCount">{{ missing_german_movies|length + (missing_german_series|map(attribute='episodes')|map('length')|sum) }} Einträge ohne Deutsch</span><span class="stat scan">Kein deutsches Audio und keine deutschen Untertitel</span></div><div class="tablewrap missing-table">
+<section id="missing" class="view" data-source="radarr"><div class="stats"><span class="stat" id="missingCount">{{ missing_german_movies|length + (missing_german_series|map(attribute='episodes')|map('length')|sum) }} Einträge ohne Deutsch</span><span class="stat scan">Vorhanden oder wird gerade geladen · Staffel 0 ausgeblendet</span></div><div class="tablewrap missing-table">
 <table id="missingMovies"><thead><tr><th class="col-title">Film</th><th class="col-quality">Qualität</th><th class="col-state">Status</th><th class="col-audio">Audio</th><th class="col-subs">Untertitel</th><th class="col-video">Video</th><th class="col-size">Größe</th></tr></thead><tbody>{% for r in missing_german_movies %}<tr><td><span class="title">{{ r.title }}</span><span class="year">{{ r.year or '' }}</span></td><td><span class="badge {% if not r.missing %}quality{% endif %}">{{ r.quality }}</span></td><td><span class="state bad">Ohne Deutsch</span></td><td><div class="badges">{% for l in r.audio_languages %}<span class="badge">{{ l.flag }} {{ l.name }}</span>{% else %}<span class="muted">—</span>{% endfor %}</div></td><td><div class="badges">{% for l in r.subtitle_languages %}<span class="badge">{{ l.flag }} {{ l.name }}</span>{% else %}<span class="muted">—</span>{% endfor %}</div></td><td>{{ r.video_codec }}</td><td>{{ r.size }}</td></tr>{% endfor %}</tbody></table>
 {% for group in missing_german_series %}<details class="series missing-series"><summary>{{ group.title }} <span class="muted">({{ group.year or '—' }}) · {{ group.episodes|length }} Episoden ohne Deutsch</span></summary><table><thead><tr><th class="col-title">Episode</th><th class="col-quality">Qualität</th><th class="col-state">Status</th><th class="col-audio">Audio</th><th class="col-subs">Untertitel</th><th class="col-video">Video</th><th class="col-size">Größe</th></tr></thead><tbody>{% for r in group.episodes %}<tr><td><span class="title">{{ r.title }}</span></td><td><span class="badge {% if not r.missing %}quality{% endif %}">{{ r.quality }}</span></td><td><span class="state bad">Ohne Deutsch</span></td><td><div class="badges">{% for l in r.audio_languages %}<span class="badge">{{ l.flag }} {{ l.name }}</span>{% else %}<span class="muted">—</span>{% endfor %}</div></td><td><div class="badges">{% for l in r.subtitle_languages %}<span class="badge">{{ l.flag }} {{ l.name }}</span>{% else %}<span class="muted">—</span>{% endfor %}</div></td><td>{{ r.video_codec }}</td><td>{{ r.size }}</td></tr>{% endfor %}</tbody></table></details>{% endfor %}
 {% if not missing_german_movies and not missing_german_series %}<div class="empty-state">Alle vorhandenen Filme und Episoden haben deutsches Audio oder deutsche Untertitel.</div>{% endif %}</div></section>