feat: Route OpenRouter requests via Nebius with FP8 quantization

- Added OPENROUTER_PROVIDER_PREFERENCES config
- Prioritizes Nebius provider for better availability/speed
- Uses FP8 quantization for quality/speed balance
- Falls back to other providers if Nebius unavailable

src/app/actions/gemini-vision.ts

@@ -5,7 +5,7 @@ import { BottleMetadataSchema, BottleMetadata } from '@/types/whisky';
 import { createClient } from '@/lib/supabase/server';
 import { trackApiUsage } from '@/services/track-api-usage';
 import { checkCreditBalance, deductCredits } from '@/services/credit-service';
-import { getAIProvider, getOpenRouterClient, OPENROUTER_VISION_MODEL } from '@/lib/openrouter';
+import { getAIProvider, getOpenRouterClient, OPENROUTER_VISION_MODEL, OPENROUTER_PROVIDER_PREFERENCES } from '@/lib/openrouter';
 
 // Schema for Gemini Vision extraction
 const visionSchema = {
@@ -111,6 +111,8 @@ async function analyzeWithOpenRouter(base64Data: string, mimeType: string): Prom
                 ],
                 temperature: 0.1,
                 max_tokens: 1024,
+                // @ts-ignore - OpenRouter-specific field
+                provider: OPENROUTER_PROVIDER_PREFERENCES,
             });
 
             const endApi = performance.now();