fix: Add retry logic for OpenRouter 429 rate limit errors

- Retries up to 3 times with exponential backoff (2s, 4s, 8s)
- Also handles 503 service unavailable errors
- Logs retry attempts for debugging
- Only retries rate limit errors, other errors fail immediately

src/app/actions/gemini-vision.ts

@@ -71,13 +71,25 @@ Respond ONLY with valid JSON in this format:
   "confidence": 0.85
 }`;
 
+/**
+ * Sleep helper for retry delays
+ */
+function sleep(ms: number): Promise<void> {
+    return new Promise(resolve => setTimeout(resolve, ms));
+}
+
 /**
  * Analyze whisky label with OpenRouter (Gemma 3 27B)
+ * Includes retry logic for 429 rate limit errors
  */
 async function analyzeWithOpenRouter(base64Data: string, mimeType: string): Promise<{ data: any; apiTime: number }> {
     const client = getOpenRouterClient();
     const startApi = performance.now();
+    const maxRetries = 3;
+    let lastError: any = null;
 
+    for (let attempt = 1; attempt <= maxRetries; attempt++) {
+        try {
             const response = await client.chat.completions.create({
                 model: OPENROUTER_VISION_MODEL,
                 messages: [
@@ -115,6 +127,26 @@ async function analyzeWithOpenRouter(base64Data: string, mimeType: string): Prom
                 data: JSON.parse(jsonStr),
                 apiTime: endApi - startApi,
             };
+
+        } catch (error: any) {
+            lastError = error;
+            const status = error?.status || error?.response?.status;
+
+            // Only retry on 429 (rate limit) or 503 (service unavailable)
+            if (status === 429 || status === 503) {
+                const delay = Math.pow(2, attempt) * 1000; // 2s, 4s, 8s
+                console.log(`[OpenRouter] Rate limited (${status}), retry ${attempt}/${maxRetries} in ${delay}ms...`);
+                await sleep(delay);
+                continue;
+            }
+
+            // Other errors - don't retry
+            throw error;
+        }
+    }
+
+    // All retries exhausted
+    throw lastError || new Error('OpenRouter request failed after retries');
 }
 
 /**

src/lib/openrouter.ts

@@ -37,4 +37,4 @@ export function getOpenRouterClient(): OpenAI {
 }
 
 // Default OpenRouter model for vision tasks
-export const OPENROUTER_VISION_MODEL = 'google/gemma-3-27b-it';
+export const OPENROUTER_VISION_MODEL = 'google/gemma-3-27b-it:free';