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'.

app/main.py

@@ -333,8 +333,18 @@ def parse_artist_title(filename_or_title):
     if not filename_or_title:
         return (None, None)
     
-    # Odstrani extension
-    name = Path(filename_or_title).stem if "." in filename_or_title else filename_or_title
+    # Odstrani extension SAMO če je dejansko file extension (kratko, brez presledka).
+    # Path("ANS.NAVEZA - SREČA OPOTEČA").stem vrne "ANS" — narobe za YT title.
+    # Pravilno: samo če je string brez presledkov ali se konča na običajno ext.
+    _COMMON_EXT = {".mp4", ".mp3", ".m4a", ".webm", ".mkv", ".avi", ".mov",
+                   ".wav", ".flac", ".aac", ".opus", ".ogg", ".wmv", ".mxf"}
+    name = filename_or_title
+    if "." in name:
+        # Vzemi zadnjo piko in preveri ali je to znana ext
+        last_dot = name.rfind(".")
+        ext = name[last_dot:].lower()
+        if ext in _COMMON_EXT and last_dot > 0:
+            name = name[:last_dot]
     
     # Odstrani noise patterns
     for pat in _NOISE_PATTERNS:
@@ -1032,7 +1042,7 @@ def process_job(job_id):
                 if final_job.get("auto_upload_to_nextcloud") and _nextcloud_configured():
                     update_job(job_id, nextcloud_status="uploading", nextcloud_error=None)
                     download_name = build_download_filename(final_job)
-                    tv_station = final_job.get("tv_station", "FOLX SLOVENIJA")
+                    tv_station = final_job.get("tv_station", "FOLX SLO")
                     nc_folder = _nextcloud_folder_for_station(tv_station)
                     target_subdir = f"folxspeed/REELS/{nc_folder}"
                     print(f"☁️ Avto-upload v Nextcloud: /{target_subdir}/{download_name}", flush=True)
@@ -1300,7 +1310,7 @@ class YouTubeJobIn(BaseModel):
     subtitle_style: str = "reels"
     whisper_model: str = "large-v3"
     quality: str = "medium"
-    tv_station: str = "FOLX SLOVENIJA"  # za Nextcloud target mapo
+    tv_station: str = "FOLX SLO"  # za Nextcloud target mapo
 
 
 class StartJobIn(BaseModel):
@@ -1325,7 +1335,7 @@ class StartJobIn(BaseModel):
     # Batch tracking za multi-upload (Telegram summary)
     batch_id: Optional[str] = None
     # TV postaja — določa Nextcloud target mapo
-    tv_station: str = "FOLX SLOVENIJA"
+    tv_station: str = "FOLX SLO"
 
 
 # ────────────────────────────────────────────────────────────────
@@ -1333,7 +1343,7 @@ class StartJobIn(BaseModel):
 # ────────────────────────────────────────────────────────────────
 class DedupCheckRequest(BaseModel):
     filenames: list[str]
-    tv_station: str = "FOLX SLOVENIJA"
+    tv_station: str = "FOLX SLO"
 
 
 @app.post("/api/dedup/check")
@@ -2308,7 +2318,7 @@ async def upload_nextcloud(job_id: str, user: str = Depends(check_auth)):
     download_name = build_download_filename(job)
     
     # TV postaja določa target mapo (mapping Qnet -> Nextcloud folder)
-    tv_station = job.get("tv_station", "FOLX SLOVENIJA")
+    tv_station = job.get("tv_station", "FOLX SLO")
     nc_folder = _nextcloud_folder_for_station(tv_station)
     target_subdir = f"folxspeed/REELS/{nc_folder}"