Fix parse_artist_title (ANS.* bug) + unify station naming na FOLX SLO

PROBLEMS:
1. parse_artist_title je uporabljal Path(s).stem za stripping ext-a,
   kar je pri YT title 'ANS.NAVEZA - SREČA OPOTEČA' vrnilo 'ANS' (Path
   smatra '.NAVEZA - SREČA OPOTEČA' kot extension). Posledica: parser
   failed → ACR fallback → 'Folx' kot artist na 15+ jobih.

2. tv_station je imel dva imena: 'FOLX SLOVENIJA' (frontend default)
   in 'FOLX SLO' (qnet match output) — UI tabi niso seštevali pravilno.

FIXES:
- parse_artist_title: ext stripping samo za znane ekstenzije
  (.mp4, .mp3, .m4a, .webm, .mkv, .avi, .mov, .wav, .flac, .aac,
   .opus, .ogg, .wmv, .mxf), NE za naključne pike v YT title.
- Vsi defaultni 'FOLX SLOVENIJA' → 'FOLX SLO' v Pydantic modelih +
  templates + filter tabi.
- Nextcloud mapping STATION_TO_NEXTCLOUD_FOLDER ostane nespremenjen
  (FOLX SLO → mapa 'FOLX SLOVENIJA', kjer pač zaplane).

BACKFILL (že apliciran prek scripte):
- 15 jobov z parsed_artist='Folx' popravljenih na pravi izvajalec
  iz youtube_title (ANS.NAVEZA, ANS.BITENC, ANS. ROKA ŽLINDRE, ipd.).
- 86 jobov tv_station 'FOLX SLOVENIJA' → 'FOLX SLO'.

templates/index.html

@@ -351,13 +351,13 @@
       <!-- TV postaja: določa Nextcloud target mapo -->
       <label style="margin-top:8px;">📺 TV postaja (določa kam gre na Nextcloud)</label>
       <div class="tv-station-tabs" style="display:flex; flex-wrap:wrap; gap:6px; margin-bottom:14px;">
-        <button type="button" class="tv-tab active" data-station="FOLX SLOVENIJA" style="padding:6px 12px; border:1px solid var(--accent); background:var(--accent); color:#fff; border-radius:4px; cursor:pointer; font-size:13px;">FOLX SLOVENIJA</button>
+        <button type="button" class="tv-tab active" data-station="FOLX SLO" style="padding:6px 12px; border:1px solid var(--accent); background:var(--accent); color:#fff; border-radius:4px; cursor:pointer; font-size:13px;">FOLX SLO</button>
         <button type="button" class="tv-tab" data-station="FOLX DE" style="padding:6px 12px; border:1px solid #444; background:transparent; color:#ccc; border-radius:4px; cursor:pointer; font-size:13px;">FOLX DE</button>
         <button type="button" class="tv-tab" data-station="ONE DE" style="padding:6px 12px; border:1px solid #444; background:transparent; color:#ccc; border-radius:4px; cursor:pointer; font-size:13px;">ONE DE</button>
         <button type="button" class="tv-tab" data-station="ZWEI MUSIC" style="padding:6px 12px; border:1px solid #444; background:transparent; color:#ccc; border-radius:4px; cursor:pointer; font-size:13px;">ZWEI MUSIC</button>
         <button type="button" class="tv-tab" data-station="ADRIA" style="padding:6px 12px; border:1px solid #444; background:transparent; color:#ccc; border-radius:4px; cursor:pointer; font-size:13px;">ADRIA</button>
       </div>
-      <input type="hidden" id="tv-station-input" value="FOLX SLOVENIJA">
+      <input type="hidden" id="tv-station-input" value="FOLX SLO">
       
       <!-- Skriti settings — vsi defaulti zapečeni za reels workflow -->
       <input type="hidden" id="mode" value="track">
@@ -428,8 +428,8 @@
         <button type="button" class="station-filter-tab active" data-station="" style="padding:5px 11px; border:1px solid var(--accent); background:var(--accent); color:#fff; border-radius:4px; cursor:pointer; font-size:12px;">
           Vse <span class="cnt" data-cnt-all>0</span>
         </button>
-        <button type="button" class="station-filter-tab" data-station="FOLX SLOVENIJA" style="padding:5px 11px; border:1px solid #444; background:transparent; color:#ccc; border-radius:4px; cursor:pointer; font-size:12px;">
-          FOLX SLOVENIJA <span class="cnt" data-cnt="FOLX SLOVENIJA">0</span>
+        <button type="button" class="station-filter-tab" data-station="FOLX SLO" style="padding:5px 11px; border:1px solid #444; background:transparent; color:#ccc; border-radius:4px; cursor:pointer; font-size:12px;">
+          FOLX SLO <span class="cnt" data-cnt="FOLX SLO">0</span>
         </button>
         <button type="button" class="station-filter-tab" data-station="FOLX DE" style="padding:5px 11px; border:1px solid #444; background:transparent; color:#ccc; border-radius:4px; cursor:pointer; font-size:12px;">
           FOLX DE <span class="cnt" data-cnt="FOLX DE">0</span>
@@ -536,7 +536,7 @@
       }
       
       const filenames = newItems.map(i => i.file.name);
-      const tvStation = $("#tv-station-input").value || "FOLX SLOVENIJA";
+      const tvStation = $("#tv-station-input").value || "FOLX SLO";
       
       // Vzporedno: dedup check + Qnet match (oba endpointa, neodvisna)
       const [dedupRes, qnetRes] = await Promise.all([
@@ -681,7 +681,7 @@
         quality: $("#quality").value,
         no_subs: $("#no-subs").checked,
         llm_provider: $("#llm-provider").value,
-        tv_station: $("#tv-station-input").value || "FOLX SLOVENIJA",
+        tv_station: $("#tv-station-input").value || "FOLX SLO",
       };
     }
     
@@ -1271,7 +1271,7 @@
       actions.push(`<button class="small ghost" data-action="delete" data-id="${job.id}">✕</button>`);
 
       // TV station label (brez emoji)
-      const tvStation = job.tv_station || "FOLX SLOVENIJA";
+      const tvStation = job.tv_station || "FOLX SLO";
       const tvBadge = `<span style="font-size:10px; padding:2px 6px; background:rgba(255,107,107,0.15); border:1px solid rgba(255,107,107,0.4); border-radius:3px; color:#ff8c8c; font-weight:600; white-space:nowrap;">${escapeHtml(tvStation)}</span>`;
       
       el.innerHTML = `