Revert "Add Groq Whisper API integration (200x faster than local CPU)"

This reverts commit 5c53a27d33.

app/main.py

@@ -247,9 +247,6 @@ def process_job(job_id):
                 # Brez extension
                 fn_hint = Path(job["filename"]).stem
                 cmd += ["--filename-hint", fn_hint]
-            # Whisper provider (groq = 200x hitreje od lokalnega)
-            if job.get("whisper_provider"):
-                cmd += ["--whisper-provider", job["whisper_provider"]]
             # lang: če None ali 'auto', pusti analyze.py auto-detect
             if job.get("lang") and job["lang"] not in ("auto", ""):
                 cmd += ["--lang", job["lang"]]
@@ -503,8 +500,6 @@ class StartJobIn(BaseModel):
     # LLM za semantično analizo + popravke
     llm_provider: str = "claude"  # claude / gemini / auto
     llm_model: Optional[str] = None  # specifičen model (privzeto najboljši za provider)
-    # Whisper provider (Groq je 200x hitrejši od lokalnega CPU faster-whisper)
-    whisper_provider: str = "auto"  # auto / groq / local
 
 
 # ────────────────────────────────────────────────────────────────
@@ -610,7 +605,6 @@ async def start_processing(
         quality=payload.quality,
         llm_provider=payload.llm_provider,
         llm_model=payload.llm_model,
-        whisper_provider=payload.whisper_provider,
         current_step="V vrsti za obdelavo",
         # Počisti pretekle napake (retry-friendly)
         chorus_error=None,